1825 bust halves

please excuse the poor pictures, these are taken from my phone. i do not have any bust half books yet. the only book i have besides the red book, is the walter breen encyclopedia. did'nt see any reference to the first half. this one has the letters "A,M, R, I " attached at the bottom. is this common?
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Comments
BHNC #203
I expect you will get something clear-cut here soon. HA archives, research at PCGS and NGC are helpful for info..