Hi,
this discussion became any time more interesting.
About the rudder color.
The book from Ferdinando D'Amico and Gabriele Valentini, already mentioned above, dedicates two pages (116 and 117) to "Tail rudder painting: New discoveries" where there are several very interesting photos; two of them are:
Additionally, as I feel a bit involved because we speak of an Italian subject, I wanted to try to investigate more and I sent a memo to Ferdinando D'amico and here following is his answer translated in English:
"I would like to remind that the rudder and part of the fin were produced under license by small subcontractors, based here and there in Germany, who followed a standard painting method that varied only on colors used (from 75/83 to 81/83) keeping the same pattern, with wave (EKG-style) separation from the small lower portion painted in 76.
The above pattern was adopted since early 1944 (there is a photo of a G-6 wrecked in February by an Allied bombing that shows this type of painting on fin and rudder) and used until the end of the war on aircraft like G-6, G-14, G-10 and K-4.
To confirm that the painting of those parts was, initially, totally out of context are the various attempt by MTT and Erla to blend the painting on G-6 with patches or wave mirror in 76.
Therefore, the presence of a dark rudder on Bellagambi's plane is perfectly in line with the supply of it from those subcontractors and this is confirmed by the fact that the lower portion doesn't show any difference in color tone with the 76 used on fuselage and apparently has the typical "EKG-style" demarcation".
About the other question, the marking on wings, this is a question I raised when I made my Miani's G-14.
About Bellagambi's plane there are no photos available today the shows the upper side of wings.
Therefore i's almost impossible to be sure of anything.
Areonautica Nazionale Repubblicana (ANR) struggle to keep an Italian identity to their aircraft, so the Italian flags on fuselage and fin, but to ease identification from Flak, the Balkenkreuz on lower wings were kept in place.
A different story for upper wings.
For instance on my Miani's plane there are the black ANR fasces
instead on "Yellow 3" there are white Balkenkreuz, so any decision will be good, until new info will be found.
Hope the above will be of some help.
Cheers
Alberto