Lot 485: William Edward Trevithick, British 1899-1958- ''Av

William Edward Trevithick, British 1899-1958- ''Avro Officially Recommend Patent Castrol''; gouache with white opaque and air brushing on artist's board, initialled and numbered 66, 54.7x38.1cm: together with three others by the same artist- Experimental half tone front view of plane (in two parts), & Rolls-Royce T63; gouache/collage with white opaque and air brushing on artist's board, one initialled and numbered 63, 54.2x18.2cm, 54.7x38.1cm, 54.7x78.1cm., (4) (unframed) (may be subject to Droit de Suite) Provenance: Gifted to the present owner by the artist's widow Bessie Trevithick