This is an original WWII leather liner strap. The leather has conformed to the shape of a helmet's brim and is somewhat dry. It features a blackened brass buckle as well as United Carr stamped blackened brass rivets. The reverse of the buckle exhibits the rare patent number of 2363872, dating the strap's production to November 28, 1944. The leather is embossed with a keystone manufacturer's mark. This would be an ideal strap for a high-pressure helmet liner with blackened brass A-washers.
WWII Leather Liner Strap With Black Brass Buckle