Rare vintage 1950s mens cufflinks “K” light blue enamel silver sun moon retailer pearl

Here we have a pair of men's cufflinks from the 1950's if not earlier that seems to be quite rare. I couldn't find anything out about the “K” marking (didn't belong to anyone with that initial) and doesn't seem to be Kiwanis related. One owner.

Silver metal cufflinks (connected—do not separate) with retailer a black saber style “K” on a light blue fine enamel ground. The backs of each feature a circular white mother of pearl sun (with rays) and moon (without).

In fine condition! No original box.