Was wondering if you guys could help with a value. It is an ad glass for Check Your Oil. It is 7 1/2 X 14 1/2. Looking in Jack's Volume 2 of the Gas Pump price guide, I see it on page 211 in a Model 56 and 72 Modern Metals oil can rack. It is in good shape, one small chip that I think would be hidden under the lip of the holder. I am thinking these can be reproduced...but, was wondering. Thanks.--Alex