66 giap belonged to 4 gaid (guard division), 1 giak (guard corps).
Sign of the 1 giak of the Red Army Air Force were two inclined white stripes on the tail. The divisional marking of the 4 giad was red propeller spinner.
More at http://ava.org.ru/iap/66g.htm

This profile in full resolution should be published in the book Soviet Fighters of the Second World War by Jason Nicholas Moore.

The plane is camouflaged in standard blue grey AMT-11 and dark grey AMT-12 on the upper surfaces and light blue AMT-7 on the under surfaces according to the NKAP 1943 order from the summer 1943.

Standard NKAP 1943 grey-grey camouflage for fighters:

Yak-3 “White 86" is in the background. Propeller spinner is probably covered by a white blanket:

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