Madam C.J. Walker Black Heritage postage stamp lapel tack pin, brass tone, USA

This is a brass tone lapel tack style pin featuring the Madam C.J. Walker Black Heritage 32 cent postage stamp. The rectangular pin measures 1 5/8” long and 1” inch across with serrated edges. The back says Proudly Made in U.S.A. It is otherwise unsigned. I do not believe this pin was officially made or sold by USPS. Very good pre-owned condition.