CNG - Macedon. Archelaus. Diobol. Helmet Seller cngcoins Macedon, Kings of. Archelaus. 413-399 BC. AR Diobol (1.71 gm). Horse standing left / Crested helmet in linnear border; within incuse square. SNG ANS 71; Westermark, Carson-Jenkins Essays, Group -. Fine, roughness and porosity. Scarce. 726603