Roundel of the Royal Air Force in type C1 proportions. Was used on the fuselage of aircraft with camouflaged finishes, and also on upper surface of the wings.
British /Supermarine Spitfire
colors per  Franks, Richard (2000)       The Avro Lancaster, Manchester and Lincoln, SAM Modellers Datafiles, Bedford, United Kingdom:  SAM Publications  ISBN:  0-9533465-3-6.
Fry1989 (current code) NiD.29 (colours and proportions) Emt147 (original)