User talk:64.250.8.46

I bought a copper mug with the words, " California 1933" engraved on it at a flea market. There is no stamp on the bottom of the mug or any markings that I can see. It certainly looks like a version of a Moscow Mule mug. I am puzzled because what I read about the Moscow Mule origins indicate that the drink was introduced in the United States in the 1940's. Does anyone know more about the history of these mugs and the practice of engraving them in 1933?