Stack's Bowers & Ponterio
August 2021 ANA Auction - Online 23-25 Aug 2021
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The countermarks were applied to Bolivian pesos and four reales after it was discovered that mint workers had debased them from 0.931 fine silver to as low as 0.750 fine. All the mint officials were replaced and a new design was introduced. The other mints were instructed to countermark the debased pesos in their stock to reduce their value until such time as they could be reminted, which never happened.
Estimate: $360 - $500