Sorry but the key on your picture is not an original Caveney key.
This is what an original Caveney key looks like. It's the same
key design as for the Maltby triangualar cuff despite the Caveney
has threads inside. The keys were obviously not manufactured by
the handcuff companies.
Lars
www.holstcollection.com
![[linked image]](http://www.holstcollection.com/images/Caveney%20key.jpg)