GB QEII - 1957 46th Inter-Parliamentary Union Conference - 2 x FD Covers
a). Illustrated Cover to Pietermaritzburg with first day cancellation at Edgeware, Middlesex (no insert)
b). Private Cover Sidmouth, Devon to Bellair, Natal with first day cancellation and insert is a private explanatory postcard from sender to receiver
Stanley Gibbons "Great Britain Concise" 2022 Edition Catalogue Value £150 - FDC (SG560)