Gulf Refining Company, Pittsburgh, Pennsylvania, circa 1920s. Being non baked the very few known, probably less than five, are never found in good condition. The front on this one has got to be the best one out there, very excellent. The back has some flaking as shown. Very rare on an original painted orange 15" metal frame with early clips to hold the snap rings in. You won't find another like this one...$2400.00 SOLD!!!