Watch List notes:

Seleukid Empire, Antiochos I Soter AR Tetradrachm. Seleukeia on the Tigris, 281-261 BC. Diademed head right / Apollo Delphios seated left on omphalos; ΒΑΣΙΛΕΩΣ to right, ΑΝΤΙΟΧΟΥ to left, monogram to outer left and right. SC -, cf. 379.6b; HGC 9, 128g. 15.77g, 30mm, 2h.

Good Very Fine; toned, with aqua iridescence.

From the inventory of a UK dealer.

Seemingly unlisted in SC, this tetradrachm appears to utilise the primary control of 379.3 as the secondary control.