Darby style cuffs are not uncommon, and are still being used in some areas. They are a lot harder to pick open and escape from than swing through cuffs.
The first handcuffs are the most unsuccessful Russian model. I threw them in a box and they're still lying around somewhere. The fourth one is one of the successful models, for example, I liked. I live in Russia myself and have been wearing handcuffs in a holster for fifteen years.
Dates all wrong. Those you have marked 1970 are sometime after 1990 or 2000 or something. They are M100-1. The left ones marked 1850 are most likely from the 1980s or newer and are from India. Not particularly well made.
Russian fared the worst. Not considerring the toy sexshop ones. But, no one will have enough force to brake even the Russian ones. I.M.H.O. the Best of all are the plastic ones, no one ever dears to break them. They also cause pain. I wonder about old soviet caughs, not chinese with Russian package.
@7:30 those looked very similar to those cheap $5 diecast metal handcuffs that I remember as a kid back in the 1980s, I was able to break out of and I had a feeling they weren't going to take much pressure to give.
