Palmers Handcuffs

These are a good condition example of one of the most unique and rarest restraints. 

This pair sold for $649.89 after 17 bids with no key. 

Above, makers mark Palmer's Pat Jan 1876 Walton Bro's NY 5

 These are a very interesting design. The cuffs can be locked directly together like this, or a chain can be connected between the two.