Where does the all began (Konepaja Voima & H&R Super)

First prototypes were made by Kosti Albinus Hangelin at the 1921.
These prototypes were made before Konepaja Voima was grounded. Actually the first "Voima" handcuffs were made by Hangelin´s first company "Helsingin Konepaja"

Body shape was rounder than the models followed this prototype, but the main thing, hideen keyhole already exist.

The key was different on this prototype; it was a screw type key. 

I have two pieces of these prototypes and as far as I konw 7 pieces is on Finnish museums, but all known pieces are keyless.

Here are the only two that I know of in the U.S.

Mark Lyons O--O Cuffs wrote: ↑

Apr 11, 2024

Here are the only two that I know of in the U.S.
hill kp.JPG

Also no keys I suppose?