Watch List notes:

Kings of Macedonia, Demetrios I (306-283), Tetradrachm, Amphipolis, c. 291-290 BC; AR (g 17,15; mm 27; h 3); Diademed and horned head of Demetrios r.; dotted border, Rv. BAΣIΛEΩΣ ΔHMHTPIOY, Poseidon Pelagaios seated l. on rock, holding aphlaston and trident; at sides, two monogram. Newell - (vd. Series IV, Group B, die XCIX).
Very rare, unpublished die-combination, high conservation and old cabinet tone, good extremely fine.