It's a Verlys pattern, I believe this was a US only design, introduced sometime between 1938 and 1940. However the finishing on this example doesn't look typical for Verlys, this and the lack of a mark suggests it's probably a piece produced by Heisey in the mid 1950s when the moulds were loaned to them. It could even be more recent Fenton production as I believe they now own the Verlys of America moulds.