STB06 A most rare and specialist first day cover from 1973 for the RAF Escaping Society and the POW German camp Stalag Luft III with all its commemorative franks which was specially & historically flown nearly 50 years ago through a related military flight journey (see scan) which the Captainof the flight has personally signed the souvenir under the first day of issue Stalag Luft III frank in mint condition (two further franks on reverse - the Captain signed edition of this Stalag Luft III flown cover is scarce).