An early 20th century ruby, sapphire and diamond brooch

An early 20th century ruby, sapphire and diamond brooch, in the form of an aeroplane, set with sapphire, rubies and diamonds in yellow gold, length 2.9cm

Provenance: Richard (Dickie) Frewen Martin, O.B.E., D.F.C., & Bar A.F.C. (1918-2006), Royal Air Force fighter pilot ace during the Second World War and test pilot, and thence by descent