Watch List notes:

The Roman Empire

Constantine I, 307 – 337. Siliqua, Antiochia 329, AR 2.98 g. Diademed head r. Rev. CONSTANT – INVS AVG Victory advancing l., holding trophy and palm branch; in exergue, SMAN. C , cf. 101 (different mint). RIC –, cf. 83 for reverse type (solidus). Spink sale 4018, 2004, 257.
Of the highest rarity, apparently only the second specimen known. An interesting
portrait struck on a very broad flan, minor edge mark at six o'clock on
reverse, otherwise about extremely fine