This is a Great Britain First Day Cover issued by the Royal Air Forces Escaping Society (RAFES SC 19), featuring a unique 'Retour en Tunisie' (Return to Tunisia) theme. The cover includes a Tunisian stamp with a 25 Millimes denomination, issued in 1975, celebrating 'La Victoire A 20 Ans'. The cover bears a circular cancellation from 'PHILATELIE. TUNIS. R.P.' dated 10. X. 77 (10th October 1977), marking its First Day Cover status.

The cover's narrative describes a flight to Tunisia via a BAC 1-11 aircraft of Caledonian Airways, originating from Edinburgh to Gatwick, and then on to Tunis. It mentions Sqn. Ldr. E. Wormald. The reverse of the cover features a 'BRITISH CALEDONIAN AIRWAYS' cachet with a 'LONDON AIRPORT - GATWICK' postmark dated 15 OCT 77, indicating a special flight connection. This item is a single First Day Cover as pictured.

Verified Specifications:
• Brand/Maker: Royal Air Forces Escaping Society (RAFES)
• Item Type: First Day Cover
• Era/Style: 1970s
• Country of Origin: Great Britain (cover origin) / Tunisia (stamp origin)
• Year of Issue (Cancellation): 1977
• Denomination (Tunisian Stamp): 25 Millimes
• Topic: Aviation, Military History, Tunisia, Post-War Commemoration
• Features: RAFES SC 19 inscription, British Caledonian Airways cachet, Tunis cancellation
• Included Components: One (1) First Day Cover as pictured.