Vintage Avon Fashion "Y" Necklace Earrings Set Silvertone & Blue Ombre NOS box

Lovely silvertone filigree necklace and pierced earrings with Blue Ombre setting. This is a vintage set believed to be from the 70s. It comes in original box but box does show wear. It has an 11 inch drop with a 3 1/2 inch extender that can be removed to shorten. It has a lobster claw clasp. It is marked Avon and OS. Not sure what OS means on jewelry.