You can see on this Model 2050, how the teeth are cut along the lines in the plate and the links are added to join the two cuffs back together. The middle section of the plate is generally thrown away. Though the cuff's body wouldnt be riveted together, until the cut was made and the links were in place and pinned. Then the cuff is riveted together and nickel plated or what ever finish is put on the cuff being made.
Like was said above, it does look like some one at the factory decided to turn a hinged cuff template into a rigid cuff, for whatever reason? Could have been a special order request or maybe just a test from the factory? Its hard to say without knowing its history for sure. I can say that I have never seen one like that before.
-Richard Knip-