Watch List notes:

EGYPT, Alexandria. Diocletian. AD 284-305. Potin Tetradrachm (19mm, 8.20 g, 1h). Dated RY 4 (AD 287/288). Laureate, draped, and cuirassed bust right, seen from behind / Eagle standing left, head right, with wings displayed, holding wreath in beak, star over shoulder; signum on either side; LΔ (date) above. Köln 3235; Dattari (Savio) 5616-7; K&G 119.38; Emmett 4039.4. Brown patina. VF. Very rare.

From the Rocky Mountain Collection of Alexandrian Coins.

Emmett lists this type and year as common (R1) but only two are recorded at CoinArchives.