ER338 Victoria Mint Error - Reverse Brockage gold 1/2 Sovereign ND (1863-1880) NGC UNC Details (Reverse Scratched), cf. KM735.2 (for type). Die #86. Gold Mint Error on mirror brockage is very rare especially on such early days. Many collectors consider mules -- coins struck with mismatched dies -- to be the proverbial Holy Grails of mint errors. wo heads or two Reverse error coins are always sought after by error collectors. An Undated 25C Washington Quarter Mule -- Struck with Two Reverse Dies -- NGC MS64 recently sold for $84,000 USD on Nov 13, 2025. 

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