Giant Grip (jewellery hallmark)

The back of the clasp is stamped GIANT GRIP, CHAIN KLIK-IT, PAT.PEND. 

My research shows there was a Giant Grip Manufacturing Co in Wisconsin, USA.  They were registering patents in the 1910s and 1920s, but I did not find a patent listing for the tie clasp.

Giant Grip Klik It

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