Great info, thanks! I asked my husband and he says, yes, it's 42 inches. And he says that the back is "almost" as good as the front. It always goes right up on the wall wherever we live, so we don't actually look at the back half very often.

Gosh it makes me wonder what the rest of our metal signs are worth. This is the only gas-related one, but we have many train-related items. He's a railfan and just as intense and geeky as you guys are about petroliana. It keeps him off the streets, so I have no complaints. (OK, well maybe I would rather have a garage that I could park the car in instead of stacks and stacks of train kits and other rolling stock. :-)

Gas wise, my interest tends towards Signal Gasoline because my father owned a Signal station in Pasadena, CA in the late '40s and early '50s. But I have no memorabilia except some paper ephemera and photos that I gave to Jim.

Thanks a lot for the information! That's a lot more than I ever knew before.