Fenton Art Glass, Williamstown, West Virginia USA, early 1940s. Look closely at the shape of the opalescent areas... they're "hearts." We made "Heart Optic" perfume bottles as special orders for several customers in the 1940s. In the 1990s and early 2000s, we made Heart Optic in Cranberry Opalescent for the Fenton line, typically Valentine's Day. Search for Fenton Heart Optic on eBay, and you'll see examples, I'm sure.