On British darby cuffs they always have those weird crow foot like stampings in a circle on the cap one the end opposite the key hole.
The cheap modern imitations have the same but…
carson·18 Jan 2010·The Forum at Handcuffs.Org2 local images
I recently ran across a company in the UK that is making Replica Mckenzie Handcuffs:
"These are a reproduction of the "famous" McKenzie Mitts invented in the mid 1800s by Jacob Mackenzie. Possibly the…