Vespasian Æ As, 8.58g Lyon mint, 71 AD RIC 1170 var. BMC 811 var. Obv: IMP CAESAR VESPASIAN AVG COS III; Head of Vespasian, r.; globe at point of bust Rev: Retrograde S C in field; Eagle stg. front on globe, wings outstretched, head r. Ex Ibercoin 25, 30 January 2019, lot 385. The reverse is the main attraction here. The 'S C' is mistakenly struck retrograde, a major error on the engraver's part. I wonder how many of these were struck until the mistake was noticed? It's the first one I've come across. Errors like this are quite rare in the Flavian era, which would probably indicate there aren't many examples of this reverse die that survived. This As was struck in 71 when both Rome and Lyon produced a massive issue of bronze, which may somewhat excuse the error. Rare even without the retrograde 'S C'. Also of note, the 'S C' on this type is normally placed on either side of the eagle's wings, here it is on either side of its claws. Feel free to post your 'Friday afternoon' coins!