These I believe are from around the Civil War or that era they are riveted and are made of Iron and I have one key. I seen a pair similar to these and they were dated 1862 mine are not dated they have patent applied for on them and I could not find any other markings. They have some rust and need to be cleaned I used the key and they still work. These are as found condition I can't guarantee the year but they sure look and feel like old iron. I am selling these with a reserve thanks and good luck. - eBay (21 June 09)
This set of handcuffs was sold with a 'Buy-it-Now' price of $350 (Plus $12 Shipping).