1972 S Silver Color Lincoln Memorial Penny - Silver Colored

I have no clue as to this coin and where it came from. Not sure if its on a different planchet or what? I have looked at it under a microscope as I have with others that were plated a gold color, and it does not seem to appear to be plated with anything. I mean I am not 100% sure on it because I do not want to scrape the coin and ruin any of its perfection. But I have looked into a few of the pits inthe coin as I said with a microscope at 600X adn I see no copper in the marks it does have from wearing in circulation. I cannot find any information on it. Maybe if anyone can tell me I would love to know their thoughts on it. I have also posted next to it two other pennies showing its true color differences. 7 pictures front and back.