This is a First Day Cover (FDC) issued by the Royal Air Forces Escaping Society (RAFES), designated SG19. The cover commemorates a significant event with the theme "ΕΠΙΣΤΡΟΦΗ ΣΤΗΝ ΚΡΗΤΗ" (Return to Crete). It features a colourful cachet depicting a woman and a picturesque coastal village scene.

The FDC includes a Greek stamp from 1975 with a denomination of 4 Drachmas, featuring a lyre player. The stamp is cancelled with a postmark from "ΧΑΝΙΑ" (Chania) dated 12 SEP 1977. The cover details two distinct flights: one on 10th September 1977 in a Greek Air Force Dakota C47 92620 from Chania over South West Crete, and another on 23rd September 1977 in a Boeing 727 SX-CBA "Mount Olympus" of Britannia Airways from Chania to Athens, followed by a flight to Gatwick. The reverse side features a Britannia Airways logo and a Gatwick postmark dated 23 SEP 77. This item is a unique piece for collectors interested in aviation history, Greek philately, and military societies.

Verified Specifications:
* **Brand/Maker:** Royal Air Forces Escaping Society (RAFES)
* **Item Type:** First Day Cover (FDC)
* **Era/Style:** Modern (1970s)
* **Material:** Paper
* **Theme:** Return to Crete, Aviation, Military History
* **Stamps:** One Greek stamp, 1975 issue, 4 Drachmas, featuring a lyre player
* **Cancellation Type:** Pictorial/Special Postmark (Chania & Gatwick)
* **Year of Issue (Cover):** 1977
* **Included Components:** One First Day Cover as pictured
* **Country of Origin:** Greece (stamps & primary cancellation), United Kingdom (RAFES & secondary cancellation)
* **Identifiers:** RAFES SG19