Watch List notes:

Crete, Polyrhenion. Ca. 320-270 B.C. AE 10 (10.3 mm, 1.00 g, 12 h). Round shield / Σ-E, spear tip. cf. BMC 1 (legend); cf. SNG Cop 534 (same). VF, green patina. 

This coin appears to be very similar to those found in Polyrhenion in Crete, but the known coins have a different reverse legend. I cannot find this reverse legend and type for any other city in Crete.