Can't find info on this square pan

[Bill A.]

Hi, I got this pan at an estate auction years ago. I can't find any similar or info online. The square base is approx. 6" square. I don't see any manufacturer marks. Thank you

 

[Doug D.]

Nothing to indicate maker. Ashtrays from BSR, Griswold, Wagner, etc. are well-known; none look like this one, though.