Amazing Pirate cob Silver 8 reales Potosi T dots 1630 Extremely rare

Potosi Mint (as Alto Peru). Silver 8 Reales - 17th Century - Spanish Empire. ; royal coat of arms (3 lilly flowers) and(x P x T x it is St Andrew Cross above, between and below) on the left and 8 (value) on the right with dots above and below.

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