1820 1-Reale......help With Mintmark.

Sorry no pics....at work with cell.

But I have a 1-reale from 1820. Very worn in spots. Looks right and sounds right but I don't know where it was minted.

On the reverse, the last 3 letters from 10 o'clock to 11 o'clock....are R (dot) A (dot) G.

......R A G.

Something was left of the "R" but worn away.

I looked online and in a Krause book.

I know "G" was Guatamala.....but what are the other letters.

Pic tomorrow if needed.

Thanks in advance!