The chalkous (plural: chalkoi) was and ancient Greek bronze coin denomination. In Pollux (4,175; 9,65f. 81) generally described as a bronze coin, the chalkous was the smallest fraction of a coin in Greek poleis. In Athens one obolos makes 8 [1. 47], in Delphi and Epidaurus 12 [1.56ff.], in Priene 16 chalkoi [1. 61f.]. The weight of the chalkos varied; the bronze coins from Seleucia/Tigris having an ◊ (= Chalkos) under Antiochus IV weigh c. 2.8-5 g [2. 271f.]; a Neronian coin with a value marking in Antiochia/Orontes weighs c. 2.5 g .
1 M. N. Tod, Epigraphical Notes on GrÖ