Watch List notes:

ARABIA, Southern. Saba'. Late 4th–mid 2nd centuries BC. AR nṣf – Unit (15.5mm, 5.00 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; all within incuse square. Van Alfen, Studies, Group SII.A, unlisted dies; CAF 1.1i; HGC 10, 720. Near EF, area of flat strike.

From the Howard Simmons Collection of South Arabian Coinage.