2 Pairs Vintage 925 Sterling Silver Coral, Genuine Stone Southwest Earrings

1" x 7/16" x 1/4" earrings with green stones are stamped "925 Mexico." The 1" x 5/8" x 3/16" earrings with 1/2" coral are stamped "925", the copyright sign & what looks like a capital "S" with a single lengthwise line through it. Better described as the dollar sign with a single line. I've come across this maker's mark a couple times on vintage sterling, but haven't been able to determine the brand or designer's name. They both came to me loose & I've put each pair on a "Sterling Silver" earring card.