P9374 would have almost cetainly have had three types of fuselage roundel applied in its brief life.
1) The factory finish Blue/Red type B at 35 inch.
2) The change to a Red/White/Blue type A at 35 inch post 23rd February 1940. And we have a shot of this coded GR-J and with no fin flash.
3) Post 16th May the fin flash was applied and in theory a type A1 Red/White/Blue/Yellow at 35 inch should have been applied. It was not. The belly landing images reveal that a non standard yellow ring, approx 2/2.5 inch wide, was just applied outside the existing type A roundel.
PeterA
