Independent oil co. Is from Tulsa. Sign was used 1925-1930. The 30" ethyl is common, the 30" with "I" is hard to find, they also had a 48". These signs are rare but can be periodically found in collector's circles.

Are you near Hiawatha, KS? I would think it could be reasonable, as it appears to be the only sign at the auction.

Collect small Oklahoma Oil Co.'s 1920's-1940's. Barnsdall, Cushing, Eason, Marland, etc.