Not into error coins, but i have two uncurulated 1955 S pennies with repunched mint marks and was wonder what something like this would go for
You will have to get better photos. And link to the match you think it is. Try Variety Vista. Com. From the photos it looks like die chips to me. Die ships are very common on S MM.
Rpm most likly the 001 or 004 the image isnt clear enough...not a die chip. Not an error a variety. Varietyvista.com for reference.