Thanks for all the replys.. I remeber exactly what the oil was,,,it was 3in 1 oil in a can can with the little red dispenser tip. All the coins still look new as they were when put in the holder..I have not taken any out yet and cleaned the oil off. I was thinking of taking one out and then put it in acetone to clean it off without rubbing on it. Just mainly to see if the oil has stained them after 45 years.