Hopefully somebody can help me out I got all the information I could before I asked you guys and this is what I found out So this is the information that I squandered up there's many of these over mint marks on the 49 nickel the challenge I'm having is variety Vista doesn't list any dive markers for it so I went on to Wexler and I can't figure out which one he has it for either so I really need some help it's a 1949 D over s Jefferson nickel
Not seeing an OMM. Maybe a RPM. Check Brain's Varieties, compare yours to his for the same year/mm. https://www2.briansvarietycoins.com/shop/cat/4
I do not see any "s or portion" in any photo, sorry. You might try a 10X , or 20 X or so glass magnifier. Your naked eye usually has better resolution than any pixal camera under $500+. Jim