This handcuff is a copy of a Tower Double Locking handcuff. It is similar to a genuine Tower, but has several significant differences. The two handcuffs are joined by a chain instead of the three rings or swivel found on the genuine article. The key hole is sideways instead of up and down. The arms of each handcuff have rounded ends and feature a "knob" that prevents them from closing too far. The manufacturer and age of this copy is unknown.