The cuff is the rare German "Berliner", and is a very nice example of one. There is an extensive article on them in Joe Lauhers "Handcuff Annual". There are also pictures of several types on my handcuff CD. I have a few of the 2007 version left at $ 10.00 each, and the 2009 version at $ 20.00 will be introduced at the Cannons Escape Convention in October.
There is more info on my web site
http://www.HANDCUFFS.US.com
Stan