Roundel of the Royal Air Force in type B1 proportions. Was used on fuselage. Yellow is to improve contrast with camouflage finishes until replaced with type A1 roundels.
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)