The ultimate diver watch? Not your average Seiko | SLA023 Blue Marinemaster 

I have 4 Seiko's with screw down crowns including a MM200 SPB079. All of them require a little back spin to be sure to find the start of the thread. Seiko screw in crown action feel somewhat like the Rolex twinlock crown, not particularly smooth. While the Rolex triplock feels very smooth due to an o ring within the crown. Now on to that Chronostop. In the late 70's my friend came to school one day wearing this Omega Chronostop on an expandable mesh bracelet(I think it originally came on that). He obtained it from his elder brother somehow. I handled it for a while and remember the start, stop and reset were performed by the same button. I believe Oris had a similar watch at the time or later. I think the Chronostop just had the text 'Geneve' above the 6 o'clock and the watch has always been part of my memories. Memories that include the final yrs of school with my good friend, I hope he is well. Would be grateful if you could share your story of that beautiful piece. Either way just seeing it made me smile. Thank you☺💜

The marinemaster 300 is the best looking dive watch watch in the world bar none. Its iconic.

I love stopping by and checking out your new videos. It's always a pleasure to see how your channel is progressing in quality -- your photography in particular is " crackin' " in this video! :)

Wow beautiful shots you have of the MM300.. you make me want to revisit this watch again!

Great review. Just picked this up last week and still not worn yet. The black version (SLA021) is my most worn watch out of my 30 watch collection, which includes more expensive Swiss pieces. Great great watch. Anyone who likes divers should really consider one of these.

I would say the MM is an actual tool and the BB58 is a fashion watch.

I know this is three years on, but great work pointing out the strengths of this watch. I've been wearing the SLA023 as a daily for the past year and can attest to the awkward crown, it takes that quick, counter-clockwise twist to get to the starting point. I was wondering the same about it being just my watch as I have a first generation Monster and a the SBBN031 Tuna and they both are effortless when it comes to the crown.

Fantastic video, full of information! Wearing my SLA047. as I watch!👍

I’ve always loved the look of these. The finishing. The dial. So good. But it’s heavy and tallish. I tried one but with a rubber strap that I didn’t care for. I wonder how my thoughts would change if I could try it on the bracelet.

Great review. This piece is too chunky for me to ever wear, but it's always nice to appreciate it from afar. Fantastic production quality and lighting too!

Nice video. Love the yellow hand on the blue dial.

Great review. Always been a big fan of the MM300. I thought about getting this very SLA023 but ended up with a SLA037 instead.

Ryan sent me! Video production is tight! Bravo! :-)

Very nice seiko. I got the turtle Padi, the difference in price is a point to take. Please review that beautiful Omega you showed at the end of the video. Thks.

I have seiko spb187 mm200 im really happy with what’s gorgeous and stylish watch 😍 next will be Tudor black bay

Great review

I would have this every day over a Tudor or even a Rolex, thanks for the review.

Great review. I just received my Marinemaster SLA047 from Bezel House and couldn't be happier. They were awesome and Marinemaster rivals any of my Rolex, Tudor, Panerai, Omega, and Grand Seiko. In fact, I think this is the best Seiko or Grand Seiko diver hands down especially considering value proposition. Cheers

I got the cheaper version of this watch (SPB207 I think) with the green dial and I'm pretty in love with it. I like the different finishes on the case and the bracelet is so comfortable.

This watch is absolutely Gorgeous 😍

great video!

I love that watch, I’ve got the reasonably priced Sumo Gen 3 with the 6R35 movement, yes the MM is a superior finished movement, clasp and indices but there’s not enough between the two for the price difference IMO.....certainly not at retail.

Own the sbdc033 or Blumo but wow 🤩 do I want this watch 👍🏻

Best diver watch there is!

Really good, thorough review. Finally, someone who appreciates the clasp! It's a really practical clasp for diving. This is an amazing watch, probably closest to the Tudor Pelagos in terms of quality, although I'd trust the reliability of the Seiko more. For me, its only downsides are the new Prospex logo which cheapens the look and the bracelet, which works fine, but is aesthetically a bit crude compared to the latest from Omega, Tudor and Rolex (but hey, no fake rivets!). A bonafide pro dive watch for wannabe watch money.

The blue and the green version a both really stunning. I just reviewed my black Marine Master on my channel. Sometimes im tempted to add some color to my collection!

I feel this is a wasted opertunety by Seiko, if they were to listen to the public on the issues this watch has and then refined them you really would have special watch on your hands, the mm300 has many unessary issues that after over 100 years of watch manufacturering shouldn't be there. In regards to the Crown operating, I can't believe its still present (yes) the Crown has a unessary fine thread just begging be striped. A issue that's not present on a sumo, which begs the question why Seiko why.

Awesome review, hope we’ll chat sometime at the Bezelhouse.

If you could choose only 1, sla021 or sla023? great review btw!

Beautiful intro

Do you have problem with triangle lume area?

Is it worth buying mm300 without un adjusted movement?what’s the daily accuracy of the watch?can the watch fit in small size wrist?any issues problems while using the tool watch?

How would you compare the MM 200 to the MM 300? I know the 200 cost less, but is it inferior?

This watch with the LX line bracelet style would be perfect. The bracelet really lacks behind in terms od design and looks dated. Same as the bracelet on the Omega SMP300.

Seiko crowns screw in not as smooth. It is normal. Little rough but never been an issue.

Bezel House, as in Calgary?

Oh my god, that endlink gap is sickening

How long did Ryan take to send you shipping notification? 7 months? He no longer owns the Bezel House. Couldn't keep up with orders as it was a part time business. Hopefully new ownership will be better. Couldn't be worse than when Ryan ran it. Just brutal CS.

Give me a freaking break. Does any Seiko diver ever have an aligned bezel?

its beautiful but wears like a brick awfully uncomfortable

such a quiet video.

Who is actually diving down at 300 meters really? At that depth your down time is so low and it is so dark that it problaly wouldn't be fun unless you are working in oil rigs and then i would ratter have a dive computer lol

"Star of the bracelet is the diver's extension?" It's the very worst part of the entire watch. Seiko can't make a bracelet or clasp.

just got the newest SLA039 from Ryan at Bezelhouse. amazing watch for the price. about the problem screwing in the crown, my 2020 SLA021 had this problem too. but they seems to have corrected this with the newest revision, with the lume at 3. crown action is much nicer and the unscrewing and screwing in and clicks are almost rolex like.