Re: Photo USAAF Aircraft
The tail marking was changed to showing the serial (radio call) on 28 Oct. 1941 in T.O.07-1-1A though recommended previously in April and August by Maintainance Command; not much time to re-paint before Dec.7 (assuming they had paint stocks). The planes in Clint's photos have 4-position wing stars which were reduced to top left-bottom right on 22 Oct. 1940 (Spec. 24114) when camouflage was also introduced--which was speeded-up after PH.
Photos most likely before then, sometime in 1940 as you thought except for a couple.
Regards
Nick
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