Watch List notes:

ARABIA, Southern. Saba'. Late 4th–mid 2nd centuries BC. AR nṣf – Unit (19mm, 4.05 g, 6h). Imitating Athens. Helmeted head of Athena right; N (in retrograde South Arabian; mark of value) on cheek / Owl standing right, head facing; olive spray and crescent to left, [symbol(s) to right]; all within incuse square. Van Alfen, Studies, SII.B.36; cf. CAF 1.4 and 1.7; cf. HGC 10, 721–2. VF, toned, rough surfaces, double struck and die wear on reverse.

From the Howard Simmons Collection of South Arabian Coinage.