Watch List notes:

GREECE: 5 Okas (5.6.1944) in black on green and yellow unpt. Partisan standing between a village on fire and harvesting scene at center on face. Violet cachet of General Headquarters on back. Without serial number. Printed by ΕΛΕΥΘΕΡΗ ΕΛΛΑΔΑ (=Liberated Greece). Inside holder by PCGS "ABOUT UNC 50 / Foreign Substance". (Hellas 278j) & (Pick S161r).