AT least I found that , "durable - dot" fasteners is U.S.A. . dot fasteners (part of scovill fasteners) is at clarkesville , Ga. still. And still contracted to the U.S. military.
lace up top is very odd , neat but, odd.
Maybe you can contact them to see when this trade mark was first used by them / first contract with the government with this trade mark ????
