Claudius, 41-54. Quadrans (Copper, 16 mm, 2.51 g, 7 h), Rome, 5 January-31 December 42. TI CLAVDIVS CAESAR AVG Hand to left holding scales; below, P N R. Rev. PON•M•TR•P•IMP•P•P•COS•II• around large S C. BMC 181. Cohen 73. RIC 91. A sharp, clear and remarkably attractive example with a fine green patina. Extremely fine.
P N R probably stands for pondus nummi restitutum, which refers to the raise in the weight of coins at the beginning of the reign of Claudius