Hi Jean-Luc
Fantastic work! A real inspiration for anyone considering tackling the South Front model - although, with two of the blighters in my stash, it's a little bit disappointing that you had to put in
quite so much work to make something presentable out of the kit.
As regards the black-outlined star - they were a common variation. Erik Pilawskii states in his book "Soviet Airforce Fighter Colours 1941-1945":
"
Black Bordered Star - A national star with a thin black border very popular in the 1941-43 period, particularly with certain aircraft programmes (for example on Yak fighters). This type of star fell out of use during 1943, and was not usually seen thereafter."
All the best
Rowan