[Grzegorz Cisek]

I looked into Messerschmitt JaPo Bf 109G-10/U4 (page 9). Here is an explanation of this second plate used on G-10 version. The word “Anderungsstufe” means exactly “level of changes”. This plate pointed to the dates of changes made during production period. To put in other words it meant that all by date actual modifications had been done. This explanation sounds reasonable.
But I can’t still believe that all defected or damaged aircraft were repaired to their original version. It would be nonsense. Moreover it would be very often impossible to do because parts which would be necessary to repair a particular plane might have been inaccessible. Certainly all repaired planes have been upgraded to new versions. I can’t imagine that the old G-6 and G-14 parts in such a country like Germany were simply recycled. I don’t believe that all G-10 planes were completely new and the factories used to their production new parts only. Good example of that is “yellow 11” (Gigi) from II./JG 52. It is evidently a mixture of G-6 and G-10. Such a mixture had to be done in a factory only and not in any case as a field modification.