History:
39MU 4-6-41 DeH spring tab ailerons fitt CRD RAE 15-7-41 trls with spring tab plus cord on trail edge. comparison trls with Bf110 8-42 trls with Oboe and Gee (Cat and Mouse) equip G suffix applied to serial. Further trls with sliding inertia weight on elev syst. 39MU 8-11-42 Cv ASRIIc 277Sq 28-1-43 61OTU 26-1-44 SOC 30-12-44
* for acronyms please see source:
Spitfire Production