Comparing the Seiko SLA045 MarineMaster 300 with the Rolex 116600 Sea-Dweller 4000 

The Marine Master is really a stunning watch.

Which one would I like to wear, you ask? I have the blue MarineMaster and it feels so great and luxuriously, as you mention. So MarineMaster for me all the way! It is boring to have a Rolex in Hong Kong (everyone has one). The crystal on the Seiko is domed on the underside and with AR coating, and that beats the Rolex. The design of the MarineMaster is much more tough and “brutal”, but done in a luxurious way.

I have an SLA021 incoming. With the recent price rises and unavailability of Rolex watches I don't really like walking around with my 16610 Sub. I've also had it for many years and fancy a change. I bought an SPB187 and the case shape prompted me to order an MM300. Thank you for a very interesting and thoughtful review, and comparison.

I just picked up the 140th Anniversary SLA047 black bezel green dial and I couldn't be happier. I own watches many different houses- Omega, Rolex, Tudor, Breitling, Grand Seiko - and I have to say that the Marinemaster is as good or better than those brands... Superbly designed and at a fraction of the cost! Also, my big worry was how it was going to wear and although my Rolex are the most comfortable, the MM300 is supremely comfortable, even more the than watches like the Pelagos, PO, Seamaster, etc.

The difference in price makes it a win win for me on the MM300. It's basically a GS disguised as a Seiko at a modest pricepoint

MM300 is a gorgeous watch, however I ended up purchasing the MM200 instead due to the size of the MM300. The sub is a classic, for some a grail, I enjoy the simplicity of the Sub but the MM just has something refreshing about it. It makes it's subtle mark and it is such a reliable watch, now it looks more than just a tool watch, its a reliable tool watch with such attention to detail that it is honestly a collector's piece that can be for the general population as well. Great comparison.

Two great watches, the Seiko has more personality, I think we can all agree on that. Great review, it is good to see someone enjoying his watches like you do, without being biased towards third party sponsor or interest.

I have the green SLA019 which I wear on the bracelet and the black SLA021 I bought in Japan that I wear swimming surfing, kayaking etc in the excellent silicone band. They are luxurious and great tool watches simultaneously as you say. I love the retro vibe too. Different to my Subs and SDs as you described but these have always been a special Seiko to me. All my 8L35s (incl SLA017, 033 & 043) all run approx +3-4s day in and day out. 😎

I have a Rolex and Seiko Prospex LX. Love them both and both great sports watches. I find I wear my LX more than my Rolex. It's strange to admit that but it's true.

A refreshingly honest review done by a true enthousiast 👍🙏 (and I agree on the SLA045’s qualities as I have one myself 😇)

Great comparison, man. Brilliant to see someone offer true objectivity. The sign of a genuine enthusiast - among very few on YT. Similarly, I also own a MM300 and SD4K. To my mind (a scientific diver and collector of dive watches), these are the two finest all-round/everyday, professional dive watches ever made (ok, the Tuna whups them both as a pure dive watch, but try getting it under a suit cuff). Sure, they are at different price points, but the apparent quality is not that different. The MM300 is more comfortable (for me), more beautiful (for me), better lume, with a more practical bracelet. You can absolutely tell it was made by hand (in a good way!). But, the SD4k has the best bezel action ever (think Campagnolo Record or Abu Garcia) and is the final, ultimate expression of the Rolex diver - a genuine professional tool that will take an absolute beating and can still cut it (understated) in a suit. No oversize monstrosity, no BS Cyclops and a rare Rolex too - one for the congescenti!. But gotta say, my MM300 gets more wrist time and is a watch I strangely feel more affection for. But I find this a common thing with Seiko vs Rolex. Also, I've noticed SD4k prices creeping up, but you're right, they're still a comparative bargain.

Considering the movement, features, finishing and overall appearance, the Marinemaster is definitely a value for money.

I’ve been wearing my sla021 for 2 weeks and absolutely love it!! Nice review 👍🏻

This is calling a spade a spade. I have the MM300 and a few rolex, including the submariner. I do see as you said.

I don't have a Rolex but I own 2 MM300. 045J1 and 047J1. I would say I prefer the 045J1 more. Its colour combination is just too gorgeous.

These two match up very well. I have the previous Seiko 300 with the Marine Master on the dial and 44mm case. It looks very similar to this new version. It does wear very much smaller then you would think based on it’s caliper dimensions. Mine keeps about +5 and my Rolex SD4K is +2. The Seiko MM300 is one of the best Divers they have ever produced. It is a beast of a watch for sure but I find it manageable on my 7” wrist. Beautifully made and priced well especially compared to a Rolex Sub. My Seiko freak buddies really love this model. I have to say it’s won me over and I love wearing it now. No regrets but agree with you that Seiko should shrink their case sizes just a bit. The Rolex SD4K is absolutely the best SeaDweller Rolex has ever produced IMHO. Low production numbers only in catalog Basel World 2014 to end of 2016. It was available in ADs until probably 2018, apparently didn’t sell very well? It’s a Transitional model with all the modern features like Ceramic bezel, Glidelock bracelet, Chromalight blue lume, parachrom spring, yet it still retains the classic 40mm tapered lug case vs the Maxicase on the modern Subs. Curious how Rolex went back to this tapered lug case on the latest 41mm Subs. I guess they finally figured it out, the MaxiCase was clunky and not as elegant. I think the tapered case is much better looking and very unique to only this Rolex Ceramic Sub/SD. One day Collectors are going to figure out just how special, rare this model is and it will become extremely sought after. Your right it’s somewhat familiar and not outwardly exciting but upon closer reflection it is very different/unique then any other Sub/SD. It’s a keeper for sure.

Great review. Thank you. I sold all my Rolex years ago and proudly wear my blue Seiko SLA023J with its gold second hand and 300 m writing on the dial since several years. Much more character and individualism as well as understatement. Beautiful. Cheers

Another great video. I used to own the SBDX001 and I really miss it 😣

Push pin bracelets when made of high grade, have proven to be more dependable than screw pin bracelets.

Also from HK here, great video. It might not be the best or the most expensive diver out there but I totally get what you are saying, it just puts a smile on your face!!!

As a body smitten by the MM 300 bug this was a fun and enabling review. Thank you for this!

The MM300 is a great watch and one of Seikos best. I would like to see the GS SBGA029 or 229 vs the Rolex.

Question for you. You have your sbp149 and mm300 next to each other. Which one do you grab for a normal day out?

The SD4000 is a hidden gem and will always keep it's value. That having said : the MM300 is a wonderful watch for such a good price!

Two of my favourite watches and one of my favourite cars. The lamborghini miura, a true classic! Thanks for the comparison.

The Marine Master is pure Seiko. Forget that it is a Grand Seiko movement, in a case hand finished by Grand Seiko artisans and made in the Grand Seiko facility. It would not exist without Grand Seiko because dedicating those resources on their own wouldn't be economically feasible. These (post Marine Master) Prospex Professional 300M+ watches are an improvement on the Marine Master predecessors. They are not Grand Seiko watches though. They lack the flourishes that are at the heart of Grand Seiko. Everything Grand Seiko is highly decorated and creatively designed; This is different. This is a hand finished tool made from high end components with an attention to proportionality but not novelty. These Seiko's don't try to be anything new. They aren't lit up with adornments like the Credors and Grand Seikos. These are simple, high quality, everything you need and nothing you don't - tools. In Rolex terms, this is more old school Submariner than Yacht-master or Yacht-Master2. In Seiko terms, the Marine Master is for people who just want a top quality tool without flourishes made by skilled artisans with high quality parts.. The Marine Master makes a bold statement in its function, quality, and size. I am only considering the ceramic bezel models and I like that it is de-branded. It doesn't try to distance itself from the affordable side of the company. It doesn't hide behind a high luxury product line or tell anyone what to think of it. It stands on its own. I like that it doesn't try to be something it isn't, nor does it feel like a compromise in trying to hit an unobtainable mark. These will not fall out of fashion.

Super glad I treated myself July last year to the SLA023! Recently upgraded to Strapcode's Hexad bracelet. 🔥🔥🔥🔥

I will someday own the MM300 i love the look and appearance of this beautiful Divers watch i have a few seiko samurai's black and orange! The Marine Master is at the very top of the best! Great review!

The choice is much easier if you swap out the clanky Seiko stock steel bracelet. I got the Strape Code Hexad for my SLA045 and that completely elevate dynamics of the MM300. Thicker but smalls link that properly balance the top-heavy MM300 while giving you a better fit. Milled clasp with 6 micro adjustments as well.

Super and informative video as always Uptick. I'm seriously considering an MM300 as I took delivery of the SPB185 last week thanks to your glowing review. What a super purchase...not disappointed at all. Can't try an MM300 Yet as all dealers are still closed due to Covid19. Even though Ive just got 6.5" wrist I prefer larger wearing watches. How is it on wrist and is it very heavy? I like the thought of it having lots of wrist presence and I think superb value for money at €3k or less on used market 👌

i totally agree. the rolex is better in all aspect. but the mm300 is something special that makes the wearer enjoys it more and give smile always. I could not explain it completely but it ends up you will be liking the mm300 more.

Very nice version this. Great colour combination

this is a nice comparison. The Seiko MM300 is really a super watch.

Awesome video and I enjoyed every single minute. Two amazing watches and as you said, the Rolex is like a diver should be but the Marinemaster have something very special, I don't know what is , but is there. Thanks for another great video.

I also have both and I agree with you, both are perfect, the only difference is the rolex crown status symbol! seiko 10x better lume sea-dweller 10x better basel action! I simply adore them

Excellent Review,subbed.👍

Spot on comparison. I have the MM SLA035 and whatever the name on the dial it’s a luxury tool watch worthy of wrist time as much as my sub. For me the MM is so good it makes me second guess keeping lower range Seiko divers like the SPB149 which after a MM just seem maybe a little too lacking under the hood especially. Are you finding yourself passing on your many other Seiko pieces in favor of the MM?

nice comparison and review!

Thanks for the review and comparison. They are entirely different. The MM300 is outright bang for the buck and quite obtainable (there are other MM300 variants available). The SD4K, well, is a grail. Not everyone will have it.

Great work, thank you…

Great Video, thank you!

I will take the seiko any day of the week, real watch lovers will know you are wearing a special seiko. Really love the seiko On my wish list.

They are both great watches, I'm sure that most watch fans would be happy owning either. I have an SLA023J1, and I love it for it's exquisite execution and being rather under the radar, most people will write it down/off as just being a Seiko.

So the bezel action on the MM is better than the Tudor Black Bay 58 ??

I do not like the helium escape valve on the side, it spoils the profile of the watch. It could be hidden between the lugs, covered by the bracelet end link.

What a fantastic review 👌

Love em both.

I really like this comparison.

i got the blue one and it is by far my favorite watch!

The SLA045 case is not 42mm as stated in the beginning of the video. It is 43.5. The crystal is 40mm wide. When you combine the case with the crystal, the watch FEELS like a 42mm watch.

Interesting that you casually compares a Rolex with a Seiko instead of a Grand Seiko. Speaks volume on the Rolex. :D

interesting review!

The Marine Master is so beautiful. And that Lume is otherworldly good. Great review.

This SLA045 on a True Blue Tropic strap is great ! Can’t add a picture here so you’ll just have to believe me 😁😁😁

I’d never wear marine-master 300 on the bracelet the silicone straps are awesome and it makes such a difference in weight and being comfortable.

Issue with the SLA is that the dial work is no where near same level. The markers are extruded not applied!

You are very eloquent and articulate.

Georges St. Pierre is that you??? :0

Great Review. Both watches are beautiful tool watches. 💯

MM is really a much better tool. A matter of engineering behind the effectiveness and durability of its water resistance and functionality as a tool. The rolex has regular seals and a regular nylon seal on the crystal.

This is as good as it gets:a rolex owner intensely cooing over his newer seiko I think I'm getting a giddy 😄 I think I better sit down I'm feeling a little flush Great video

for a 300-pc LE the SLA045 is grossly under-appreciated.

My next watch, MM

Rolex is confidence, butMM makes you smile 😊👍👍

Have the SD116600. Just brought a SBDX001..

The Rolex sea dweller is a dream …perfect and unique dimensions. It’s stunning and only produced for almost 3 years … perfection

Both heavily hommaged in chinese factories

As far as i know Grand Seiko has a great diver i believe. However Grand Seiko should make a 40 mm diver

Very well done, as always. The one question you did not address is “which one would you wear if you were that professional diver for whom these watches were intended?” Having been that guy, I would say unequivocally that I would go for the MM300. Once I stopped diving, maybe became a dive superintendent or an office rep., I might go for the Rolex… and that’s a large “might” as it would only be for the status symbol. I wore a Tuna back in the ‘70’s. Most guys wore SKXs or Turtles. Had I seen a MM back then, I would’ve bought it. I have one now for different reasons: it brings me back the flavor of deep diving, the history, my own experiences and memories, like nothing else. And yes, it’s exquisitely, almos unbearably, luxurious. A Rolex’s quality being beyond debate, without crawling into the technical details, the MM makes the Submariner look and feel cheap-as a tool.

16:58 "I should be wearing my Rolex right now, and be the man" 😄

I prefer the Marinemaster on the dial on be honest, and I don't know why they refuse to improve the bracelet. That said I don't think the Rolex is anywhere near 5x the watch that the 300 is.

Seiko MM300 all day!

I have the sla047 and a dweller and hand down the seiko wins the day

116600 the only watch you’ll ever need. Done!

Sea dweller the forgotten Rolex. Almost Cellini situation. Comes to divers for me there is no alternative than the big O. A seamaster for 300 meters depth, and if i want deeper i take a Planet Ocean to dive 600 meters deep. Good you call hulk. It increased so high, it brings the sea dweller on the card as the outsider. Smurf became exotic.

the proportion are better in rolex, but cost 5 times more

The Rolex has the very best marketing, the Seiko is very much more desirable and wearable day to day.

MM300 all the way. If i pick the rolex its because i want to sell for a little extra $$ although its hard to make money from watches.

Um, how could you tarnish the legacy of such a perfect watch by putting it next to a F'ing Rolex?

tabarnak du criss, je veux cette montre

brand equity.....its not a fair comparison.

Compare this seiko with a 116600 ? Chalk and cheese my friend

You buy a Sea-Dwellet to impress others. You buy a MarineMaster to impress yourself.

Omega seamaster 300 doesn’t stand a chance between these two Juggernauts,Rolex is the best skin diver ever while MM300 is the best pure diving watch ever!!!

This is like a comparison between a Ford and a BMW.

THE marinemaster is more value for money. it is more refined and in ny Humble opinion looks more expensive. Rolex is all inflation and there is something cheezy about it

Salut, mon amie! Nous montrons votres videos.

The crown and stems on the seiko are as weak as toothpicks otherwise a great watch

The SD with its helium valve and price tag is a bit of a farce really. I don't think I could take someone seriously wearing one. Give me a pre ceramic sub any day.

Love to have a seiko MM. But I'd take a grand seiko titanium dive watch over a Rolex any day. That's just me. The spring drive movement is unreal 1 of the best in the world. 👍

I’d feel better with the seiko. Too much baggage with Rolex these days 🤷

GS doesn’t make great divers 👍. Bless you ! 😀Yes 🙌 that MM directly seduces to divers collectors even if they have multiple Rolexes like me.

Get the Rolex 16600 less bling than these and yeah a proven tool watch. All these ceramics are a pose feat!

For the money being paid for that Seiko I think it's outrageously good value for money absolutely outstanding case I would purchase that any day before I would consider a Rolex... the Rolex is way out of my league financially

You like the Seiko don't you...!

Stop it! Seiko should have you on the payroll!

With the current strap on the LX no competition, if seiko fixes that I'm in line for one!

I have owned every Rolex and sold all that crap once the prices shot up and authorized dealers became snobby little fuckers! I have a GS SBGA229 that smokes any Rolex diver at every level. I also have the MM300 which I think also smokes any Rolex diver … Rolex is now a dork brand for losers!

i think they are not from the same category so comparison is wrong

MM300>ROLEX