I’m not sure if this is a button, a pin, an earring, or something else. It is 2 pcs. The front piece is sterling silver & enamel. It measures about 5/16" x 1/4" & has a single post on the back side. The backing measures about 3/8" diameter. It is attached to or removed from the post by squeezing the two little tabs. It is marked with a dollar sign (or an “S” with two lines through it) & the word “Sterling” on the backing. Any info on the mark, what exactly this piece is or how to go about dating it will be greatly appreciated.
Thanks in advance