I was recently at a local dump here in texas, and saw an old looking sign in the bottom of an old aluminum feed bin that had been dumped.i pulled it out to find a mobiloil sign that is 2 sided and says "ask here for gargoyle mobiloil" it has a metal ring around the edge of the sign,and i was told it needed to have a raised letter feel to it to be original, which it does,with only a few dings ..i could only find a repo of the same sign on antiqnet.com.......could anyone help me with the possible age of this sign,and why the metal ring around the edge???? thank you