Hello MAssimo,
Here is the last infos that Mr Stankov gave to me yesterday regarding this aircraft:
164 IAP (295 IAD). La-5F No.39210719, #19 flown by Lieutenant Skomorokhov N.M., aircraft mechanic: senior sergeant P. Martyushev.
La-5F #19 took part in the battles near Kharkov, Belgorod, Kursk, again Kharkov, Zaporozhye, Nikopol from March 1943 until March 1944.
Airbase:
Lower Duvanka airfield (from 03.1943-),
Kremennaya airfield (from 08/23/1943 -),
Gemini airfield (from 09.1943 -),
Sinelnikovo airfield (from 09.1943-),
Solenoe airfield (from 12.1943 -)
With these informations, this aircraft was very probably delivered in AMT4/6/7 camo. Looking at the photo taken late in 1943, maybe this aircraft was repainted in AMT11/12...
Mr Stankov thinks there was only one diagonal white stripe on the vertical tail. He thinks the white stripes on vertical tails were squadron markings in 164 IAP, not unit markings of 295 IAD (31, 116 & 164 IAP)... => So another point to clarify...!!!

Regards
Stéph