Up for auction is this “SET” of Thumbkin thumb screws with the “LEAD CHAIN”. This is the first set that I have ever seen with the lead chain. Both cuffs are in nice working order and the wing nuts spin freely. Each Thumbkin measures approximately 2 7/8 inch wide by 3 1/2 inches tall to the top on the chain ring. Total length including the Thumbkins is approximately 21 1/2 inches. - eBay (25 April 09)
This set had a high bid of $255 (Plus $10 Shipping) but failed to meet the reserve price. It was relisted (here - May 09) with a 'Buy-it-Now' price of $400 (Plus $7 shipping) but failed to sell.
It seems that this set was part of this previous auction:
original antique handcuffs
The set sold for $202.50 (Plus $10.86 Shipping).
You are bidding on 2 antique handcuffs one has a chain on it. They do not come with a key but they are available online. There is surface rust on them but the look like they are in good shape. - eBay (1 April 09)