Possible 1956 OMM? Repunched Mint? What do you think?
Thank you for all of the awesome help. This site is a blessing.
looks more like a ding to me.
Welcome to the forum. It appears to me to be a deteriorated/damaged mint mark punch, or physical damage to the coin in circulation. I do not see any indication there of a second mint mark, either as a RPM or OMM .