New handcuffs arrived today so I thought I would show them off a bit.
Here is what is new (clockwise from bottom left):
ASP High Security Ultra cuffs (46109) with Duty Case, CTS Thompson Model 7083 Blue Box #2 for hinged handcuffs, CTS Thompson model 1008 Tri-Max handcuffs, and Chicago model X55 cuffs.

All three have double pawl mechanisms. Here they are compared to my Yuil M-11 cuffs:

Left to Right: ASP High Security, Chicago X55, CTS Thompson 1008 Tri-Max, and Yuil M-11.
Notice the differences, ASP and Chicago use two separate pawls but only a single spring and no blocking blade while CTS and Yuil seem to use separate springs and have blocking blades that require a groove in the ratchet arm to fit. I successfully picked the Chicago X55 using the standard improvised methods used on the more common single pawl designs. The CTS Tri-Max are the only cuffs I own that require a split tipped shim to open by shimming, Yuil has counter measures which so far have managed to prevent nearly all shimming methods I have attempted.
The ASP High Security locksets do have keyway warding which only allows a split flag key to turn, even standard ASP keys will not work. Here is a side by side comparison of ASPs with US Standard (single pawl) locksets and the High Security lockset.



ASP color codes their locksets using the double locking bar which doubles as a visual indicator of the condition of the double lock. The color codes are as follows:
- Yellow=US Standard single pawl
- Blue=High Security double pawl (special key)
- Green="European" triple pawl
- Red= training lock (allows keyless slip through)
The ASP Duty Case has a nice semi-concealed pocket for carrying a spare key:

Finally, the CTS Blue Box for hinged handcuffs. This is a much more simple design than their Black Box as it is just a U shaped piece of steel with a reinforcing rivet and a slot for the Martin link from a belly chain or other restraint belt/chain to pass through.

Here it is demonstrated on a pair of Peerless 802C hinged cuffs:


Note how it allows access to the double locking pin after it has been fitted.
Some models of hinged handcuffs which use the same faceplates as their chain counterparts (and thus retain the bulge for the chain swivel) such as S&W 300 and Yuil M-11 can be a bit tough to fit smoothly and may not be able to properly straddle the reinforcing rivet.