My first thought is the same as Keith's, that is probably a changeable poster holder. I have several Mobil posters and they were changed out quarterly from what I've found from the dates at the bottoms of the posters. Darin
Darin Sheffer Always looking for Mobil and Marathon items I don't already have!
As Keithia mentioned, I had the NOS Deep Rock posters for sale here on the forum (still have a few left). None of mine were the exact same layout as the one in Terry's station photo. However, the poster (sign) size shown looks similar. Here's the Deep Rock poster I still have that Keithia was probably thinking of. John