I have a 1937 Buffalo Nickel with a 'P' under the date. There is one like it posted on Ebay. Thought mint marks were on the reverse . . . ? ? ? Is there a reason why the 'P' is there or did someone just make a bunch of counter punch marks nickels one day. Will try to attach a link to the Ebay post . . . hope this works. http://www.ebay.com/itm/1937-Buffal...66?pt=Coins_US_Individual&hash=item4ad84fae76 Thanks