1956 Sinai Campaign "no service" mail to Egypt: 07-11-1956 reg. surface mail cv on govt. stationary ex Federal Health Office KOBLENZ to Public Health Ministry CAIRO, meter-franked 0.90DM; posted on last day of Sinai Campaign (29 Oct - 7 Nov): under circumstance, mail service to destination disrupted & cv RTS at FRANKFURT RAILWAY POST w/Ger. gummed label "RETURN TO SENDER!" tied by "Frankfurt Railway Post Office IV/2 | Forwarding Not Possible" IM h/s: unique cover - only recorded instance of 1956 Campaign "no service" marked mail from any country; nothing else known in recorded literature. Suez Canal blocked from Oct. '56 to Mar. '57.