Deco-style shallow serving bowl w/teal glaze

Hi - I have another mystery item which I hope can be identified. This is a round, shallow Deco or Streamline Moderne-style handled bowl measuring about 12 inches in diameter. It is marked with a number - 702. It has a matte glaze in teal blue similar to those seen on McCoy pieces. Any idea as to which company made this and the date? I'm also wondering if it had a matching cover. I can't find very many instances of companies that used only a number as a backstamp.
 
Pictures below. Thanks!
 

No guesses as to what this is? It's a beautiful piece, anyhow.

Lovely. The only two American factories I know are McCoy and California, but if you're on Facebook there's a group of American collectors who might help. the group's called StudioPotteryCollectors

NaomiM wrote:Lovely. The only two American factories I know are McCoy and California, but if you're on Facebook there's a group of American collectors who might help. the group's called StudioPotteryCollectors

Thank you. I just sent a request to join that group. I'll keep this thread updated if there's a response.