This is a rare model 510 Maximum Security Handcuff from Peerless with Medeco locks. These were listed at $85 or best offer and solid quickly with the original box and two original keys. Above, the Peerless chain handcuffs with maximum security lock overlay from Medeco. Note the complex tumbler style keys.  Below, better view of the cuffs and the maximum security Medeco lock in it's high impact Lexan type overlay.  These almost certainly could have sold for considerably more. The pair below sold for just over $100 without the box. The pair below is marked for BOA on th reverse of the overlay, while these are marked Peerless on the back where visible.  Peerless Maximum Security Handcuffs in orange