This is an early Hiatt gang chain end lock. Hiatt are famous for making Handcuffs but this is a more unusual item to find. Comes with it's original key and both lock and key are stamped "Hiatt" and "31". Measures 6cm at widest point. I've found very little information on this type of lock and I have to thank www.alexhandcuffs.com for the information on their website. 100% original item and sold without reserve. - eBay (18 July 2009)
This lock had a high bid of 102 British Pounds / $168.39 (Plus Free Shipping).