Quote:
Originally Posted by lane
The first two screen captures are from Re-arming filmed around June 1940. 609 Squadron Spitfire I's are shown being re-fueled and re-armed. One of the aircraft still has a black & white underside paint scheme, whereas the others have all duck egg blue undersides. Note the 100 stenciled in black paint on the fuselage at the location of the fuel tanks. This is in contrast to the 100 stenciled in white paint at the fuel tanks location of the Spitfire I shown in the instructional film The Daily Inspection of a Spitfire. The location of the 100 octane fuel stencil also varies slightly from aircraft to aircraft.
From The Daily Inspection of a Spitfire June 1940.

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According to Ted Hooton
Spitfire Camouflage 1938-1940 Scale Aircraft Modelling Vol 5 No. 2, November 1982, the transition from Black/White under-surfaces to what was meant to be Sky (Type S) - there were some unit applied colours that were non standard - took place between 6 -17 June 1940 (p. 56).
R6692 - the Spitfire in the hanger, and the subject of the maintenance film, first flew June 3 was delivered to 6MU 5 June, then 609 Sqn. 7 June
http://www.spitfires.ukf.net/p009.htm : in the film the aircraft code letter had yet to be applied, so the film was shot early-mid June, while it was still working into 609 Sqn. service. The 2nd photo of 609 Sqn Spitfires shows two of them still had black wheels, meaning they originally were painted black under the port wing, yet the undersurfaces of the wing were painted Sky, meaning the unit was in the middle of repainting its operational aircraft - again early - mid June 1940.