Nyasaland Protectorate first day cover with George VI diamond jubilee of protectorate set (SG 167-170), Zomba 15 May 1951 and Nyasaland diamond jubilee datestamps, airmail label and Zomba registration label No 246 on front; Zomba 15 May 51, Salisbury registered 16 May 51 and Kitwe 18 May 51 arrival datestamps at the back