Lang, M. and M. Crosby (1964). The Athenian Agora X: Weights, Measures and Tokens. Princeton, New Jersey, The American School of Classical Studies at Athens. (https://zenon.dainst.org/Record/000211771)
Letters Epsilon, Rho, Mu, Iota.: Elaborate thunderbolt crossed by staff which ends in trident at right, caduceus at left. Letters E P M I in the four corners.
Reference
Lang, M. and M. Crosby (1964). The Athenian Agora X: Weights, Measures and Tokens. Princeton, New Jersey, The American School of Classical Studies at Athens. (https://zenon.dainst.org/Record/000211771)
Half a mould for 7 square tokens of 12-14mm, all of the same design: a bird (dove?) standing right. There is a central casting channel and branches coming off it and nail holes in the upper left and lower right corners.
Reference
Cesano, L. (1904). Matrici e tessere di piombo. Bullettino della commissione archeologica comunale di Roma 33: 146-153