Stack's Bowers & Ponterio
Collector's Choice February 2022 Auction 22-24 Feb 2022
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According to the SCWC as well as other major references on this subject these particular countermarks are thought to have been issued by General Vicente Guerrero, leader of the insurgents of the south, 1816-1821. However, due to the lack of contemporary documentation this is speculative.
Estimate: $200 - $300