I snagged an exceptional set of S&W model 90 handcuffs on eBay last week for a very low price, and they arrived today. They look almost new after a light hand polishing, are extremely shiny (but not quite like a mirror), and have a serial number of 000381 over toward the right side of the lockcase on the back of the cuff with the S&W logo. Have I got a set of cuffs made in 1952 just when S&W started manufacturing handcuffs? I am curious because I did not know that they made polished cuffs in 1952.
Something that's interesting is that I have another set just like the ones in the first picture (same swivel, same detent location) that have a serial number of 001776, but they have a matte finish. It's strange that the finish went from polished to matte in such a short time.
It's such a shame that S&W didn't keep records like Peerless has. I did many searches on model 90's and 91's in this forum before I started this thread, and still have more questions than answers. But as they say, if you are happy with what you have, then that's what really counts.