These Chinese “H&R Super” style double-locking handcuffs are manufactured for the Chinese government. They open 6 1/2 inches to 8 1/2 inches and include 2 keys and a nylon case with zipper closure.
Patented in 1934 by Harrington and Richardson, H&R Super handcuffs were given by the USA to the Chinese government to assist in its civil war with communist forces. When the communists won and they ran out of handcuffs, it is believed that they simply made copies, improving the lock design in the process. These handcuffs are still used by most Chinese law enforcement agencies today.