Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Frontier and Sinclair Signs

Hello, I bought the Frontier sign and was wondering if someone could please confirm it’s authenticity. I bought the Sinclair sign assuming it was a reproduction for $10, but thought there was a very slight chance of it being original, so it would be great if someone told me it is real. Both backs are white.
Thank you