It's probably c. 1930's-50's... maybe even a little later. The company began as the Attleboro Mfg. Co. in 1897, and introduced a "Swank" collar holder in 1927. In 1931, they introduced a full line of Swank jewelry and accessories for men. After a merger in 1936, the company became Swank Products, Inc., and in 1940 "Products" was dropped from the name.
Cool find and another, as cool ID from PBK
I love old words like Swanky - meaning 'a show off'.
We should all try and use a new word everyday - so my mission tomorrow is ..