Ted:

I worked in a Woolco (the big box segment of F.W. Woolworth) sporting goods department during that time period. The only doubles I ever saw were all low grade Spanish guns (Pride of Spain) and Brazilian (Boitos). Both were true clunkers.

There were Winchesters, Remingtons, Marlins, Mossbergs and some Rugers on the shelves as well, but none of them were doubles. The only used guns I ever saw were Mausers (Argentine and German).

Rem