Stack's Bowers & Ponterio
September 2021 Hong Kong Auction 27 Sep - 1 Oct 2021
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An interesting aspect of the 4 Mu and 2 Mu from this series is that they were struck with errors in the legends. This must have been noticed quickly as most examples of these two denominations exhibit a correction in the form of an added downward stroke on the second to last character from the right. Rather than melting the entire issue, the mint opted to correct each coin individually.
Estimate: $1000 - $1500