ER487 EGYPT. Mint Error -- Struck with Two Reverse Dies -- 50 Piastres, AH 1436/2015. Cairo Mint. PCGS MS65. KM-1000. Struck with Two Reverse Dies, Suez Canal issue. Many collectors consider mules -- coins struck with mismatched dies -- to be the proverbial Holy Grails of mint errors. Two 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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