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I believe your coins is supposed to be a Postumus AE Double Sestertius of the RIC 143 variety. It should read IMP C M CASS LAT POSTVMVS P F AVG on the obverse and LAETITIA with AVG (rejoicing of the emperor) below the Galley (Galley should have 3 or 4 rowers, yours is worn in that area). Postumus was a break away 'Gallic' Emperor who ruled over Gaul, Germania, Britannia and Iberia and I believe the large portion of his coins were minted in Lyons and Lugdunum so he did mint coin in Britannia.
The only other thing I would say about this coin is that it looks a bit odd when it comes to the inscription and the way the galley is depicted but it might just be a variety I have not seen before.
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Pecunia in arbotis non crescit
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