Watch List notes:

Seleukid Kingdom. Antiochos I Soter. 281-261 B.C. AR drachm (18 mm, 4.27 g, 12 h). Uncertain mint in Drangiana, perhapsAlexandria-Prophthasia, coregency issue. Head of hero (Alexander or Seleukos?) right, wearing helmet covered with panther skin and adorned with the ear and horns of a bull / ΒΑΣΙΛΕΩ[Σ] ΑΝΤΙΟΧΟΥ, Nike standing right erecting trophy. SC 226a; HGC 9 -. Exceptionally rare with just a couple of specimens known! Extremely fine. 

The extremely rare eastern issues in the name of Antiochos I of the Susian tophy types of Seleukos I are not imitations, according to Houghton and Lorber, but rather official issues struck at an eastern mint in Drangiana during the co-regency of Seleukos I and Antiochos I while Antiochos governed the eastern regions of the Seleukid Kingdom.