Watch List notes:

CELTIC BRITAIN. Southern: Regini and Atrebates. Tincomarus. Circa 25 B.C - A.D. 10. AR unit. 1.19 gm. 10 mm. A large facing head (Medusa?) / A bull leaping left, head facing; TIN above, C below. S. 86. ABC 1109 (Very Rare). Good Very Fine. The obverse design on this issue is too large for the flan, something reflected in virtually all the examples of this type.