This is one deactivated bolt for the Welrod Mk IIA, 7,65mm Browning. The silenced Welrod was the Special Operations Executive agent weapon during W.W. II. It is marked "UNSERV" and the area in the bolts head w some metal is grinded of is a bit rusty. It is manufactured post war. Do you need some Welrod spare parts or have any questions? -Send me a e-mail! Good luck bidding.