Watch List notes:

The Roman Empire
Gaius, 37 – 41

Denarius 40, AR 3.71 g. C·CAESAR·AVG·PON·M·TR·POT·III·COS·III Laureate head r. Rev. S·P·Q·R / P·P / OB·C·S within oak wreath. C 21. BMC p. 150, note. Giard 183. CBN 39 (Lugdunum). RIC 28.
Very rare and among the finest specimens known of this very difficult issue.
Light iridescent tone and extremely fine

Ex M&M 72, 1987, 727 and M&M 92, 2002, 26 sales.