Other denominations also have the 10Ds 20Gs markings which indicate the fineness of the silver. That said, I think I can make out 8R at 9 o'clock on the cap side, followed by Go for Guanajuato. The initials P.F. are legible. Assayer P.F. worked at Guanajuato from 1848 to 1862. Unfortunately, only 18-- is visible for the date. The other digits may be discernible in hand.
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