These turned up recently. I have emails from Chris at Peerless. He says these are the only ones he has ever seen! Notice the 1916 Patent date. 1916? Peerless never had a 1916 patent date for the post key style cuffs! It should read "1915." This was a mistake, done at the factory. No idea on how many could be out there? Check your cuffs closely, maybe you have one? Side note: Today I got another set in with the same stamp. So, we know of 2 cuffs marked like this so far.