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

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 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 best original box.