TC: Celtic silver coin from Danubia. $44.00 Jul-21-01 Seller tomcederlind THE DANUBIAN CELTS . 3rd-1st Century BC. Silver Tetradrachma (29mm), of concave fabric, in imitation of an issue of Philip III. (15.65 gm). O: Almost plain, but has faint traces of a head of Herakles, as is typical for this issue.. R: Zeus enthroned, l.. De La Tour 9640; Forrer 336. A fascinating coin, VF.