Still waiting for response from David Sear but Curtis Clay thinks it is genuine :-)
OK guys, I'm back :) It is this coin (11,66 gr): https://www.deamoneta.com/auctions/view/474/288
I just had just bought a silver Salonina because I thought there were no nice bronzes available, but then I found this Sestertius-sized (29 mm)...
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