EDIT-super newb post. Answered LOL
CRH4LIFE
Posts: 849 ✭✭✭✭
Torn between RPM and perfectly placed damage as a memeber of a fb coin forum mentioned. No one has marked it off as damage yet simply stated to keep untill another found. Figured I would get some valuable opinions 
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'78 RMPs are not made any more but can be found at vinyl record shops and overpriced flea markets.
That's what I like, Roger. Good flea markets and humor.
``https://ebay.us/m/KxolR5
Perfectly placed knick that raised the metal to look like an RPM.
Post-mint damage.
Seems to be PMD. Looks like something pushed the mintmark over, damaging it.
The flat and shelf like area where the mintmark was originally looks "Sheared" to me.
Hope this helps.
Pete
I would agree.... PMD... the sharp impression below the mint mark substantiates this... Cheers, RickO