Help with mint mark on Magnentius coin

I cant seem to figure out the mint mark on this Magnentius.
Can anyone help me out ?

 

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That's weird, indeed. I've been thinking about this and I wonder if the letter in the center of the exergue is an R with a filled die. There is a star at the top, just to the right, and the emperor has no shield and the barbarian is bare-headed. This would match issues by the Rome mint (RIC viii, p. 267, 209), but the second letter doesn't match any of the officinae: P B T Q E or S.

I'm curious what others think.

 

There seems to be only 2 letters although these are pushed over to the right but I can't make out if there are any symbols to the left? ...A two letter mint could be Rome?

Oops RC beat me to it......Would like to see a pic of the ob..

 

Here is a pic of the front.

 

My guess is that there are three letters in the mint mark and that the first one is missing.

 

Those can be found from unofficial mints too.

Maybe that webpage can help : https://www.nummus-bible-database.c...29&nombreResultats=50&btRechercher=Rechercher

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