History:
FF 12-1-42 9MU 25-1-42 M46 install armament removed AAEE high alt trls with mod cowling and exhaust manifold. 5-42 strengthened split flaps used as air brakes. trls with MkIIN IFF M45 re-fitted for trls of power coefficients and prop blade angles. To 4237M 1SoTT 22-10-43
* for acronyms please see source:
Spitfire Production