Unique ID: 47
This is a bit of a mystery coin as it isn’t in any of the reference books. It appears to be part of the GB-D family, and specifically the later uniface type with ornaments on the obverse. However, it is smaller than these coins, and unlike the others, minted on a globular flan. Most auctions describe it as a variant of DT 255 (as it also has a ringed pellet on the obverse), but the reverse and the flan are significantly different. Without more information, it will be assigned to the Morini with a date towards the end of the Gallic wars. Rarity is based on examples I have found online.
GB-D types in the collection: