Watch List notes:

KINGS of PERGAMON. Attalos I. 241-197 BC. AR Tetradrachm (29mm, 16.93 g, 12h). In the name and types of Alexander III. Pergamon mint. Struck circa 223-215/0 BC. Head of Herakles right, wearing lion skin / Zeus Aëtophoros seated left; no control marks. Kleiner, Alexander, Series I, dies B/– (unlisted rev. die); Price 1473; SNG BN –; BN inv. 1971.939 (same dies). Toned, slightly off center. EF. Rare, six noted by Kleiner, two additional in Pella, only one (correctly attributed) in CoinArchives.