★★★★★ Smith & Wesson Hinged Handcuffs Double Lock Model 300 - Amazon 

These cuffs I got on Amazon are genuine Smith & Wesson: amzn.to/31WibLf
These hinged cuffs are MUCH more difficult to pick when your hands are behind your back. (I actually couldn't do it) The ones with the chains offer much more movement and it's easy to access the locking mechanism.
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Original review from Beau Chevassus, Knok Studio (Media for non-profits), www.knok.org (Seattle nonprofit) Knok.org
Beau Chevassus is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate Beau Chevassus earns from qualifying purchases.
From Beau Chevassus: amzn.to/2BB1pGJ