Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Help!!! Is This a Douglas Oil Co Flag?

A client was in my office a coupe months ago and saw my gas pump and oil cans. He stopped by out of the blue yesterday to give me a flag he says is Douglas Oil Company Aviation.

I have no knowledge and any assistance identifying & approximate age would be appreciated. It measures 20"x30" and sure is in nice condition as it has been in plastic bag for a very long time

Thank you;