Howdy all,
I'm sure glad to be on this forum finally. I've heard OldGas is one of the best resources, especially for a newby picker like me just getting started. I have an opportunity to buy this Sterling motor oil sign and wanted to see if anyone could educate me on how to determine if it's authentic, estimated value and any history on the sign and the company it represents. Any tips on how I can ensure it's legit would be very welcome. Thankya much y'all.

Untitled-1.jpg
Sterling Motor Oil tombstone sign