The picture shows a view of this Old Jenny Motor Oil Advertising KeyChain Or Ring Tag. It is made of heavy paper with a printed foil front. The back is white. I believe that this was probably put on your key ring after servicing or an oil change. It is not dated but old. It appears to be unused. It is diecut in the shape of an oil can and it reads:
JENNEY SOLVENOIL TRADE MARK REGISTERED - U.S. PATENT OFFICE THE EXTREME PRESSURE MOTOR OIL 100% PENNSYLVANIA OIL OIL CHANGED AT
It measure 1-3/16" x 2" and in near mint unused condition.