Hey guys,
Looking for a little info on a Standard Filling Station sign. It is the 9 1/2'x 15" porcelain. There are five sets of 2 vertical holes that looks to me like they came from the factory. I saw another sign like this one and it looks to have the same holes. My question is this: Were there additional signs that bolted to these? On this particular sign, there is a painted tin sign bolted in the three sets of holes in the middle that looks to read "Products". But that still leaves one set of 2 holes on either side of the tin sign for something else. Does all that make sense?

One other question. The info in the bottom right corner is "ADV 583 (A.D. 2088). Does anyone know what all that means?

I know you Standard guys will know.
Thanks in advance for the info.
Chevelle SS