Watch List notes:

Gaius (Caligula), 37-41. Quadrans (Copper, 18 mm, 3.10 g, 6 h), Rome, 39-40. C CAESAR DIVI AVG PRON AVG around pileus flanked by large S C. Rev. PON M TR P III P P COS TERT around R C C. BMC 63. Cohen 6. RIC 45. Green patina with rough earthen deposits. Good very fine.
From the collection of W. M. Stoecklin, Winterthur, Switzerland, acquired prior to 1981.