Hi,
I've found a small page in Russian on him.
http://www.airwar.ru/history/aces/ace2ww/pilots/efimov.htmlNothing conclusive, but I paste an automatic translation:
The entire combat history of Alexander Efimov is associated with Il-2. During the war he was succeeded by at least seven cars, not counting those which made the individual flights. Arriving at 1-198-Squadron of Shap, until mid-winter 1943 Efimov flew on an airplane with a single number 17, which has been preserved and the resulting two-seater car instead. Being in July 1943, commander of the 2nd Squadron, the pilot changed the number "two", which is invariably present at all of its planes by the end of the war, including after the transition to the 62nd Shap. Number of 198-m Shap deposited on the steering wheel rotation, color and style varied on different machines.
The two IL-2, AN Efimova (no-one in the 198-m and 62 m Shap). was the inscription "Homeland." Pictures of them yet to be found.
IL-2mZ (modified version of attack aircraft with larger sweep of consoles), as shown on the tab, AN Efimov flown in 198-m Shap autumn 1944 - winter 1945, before joining the 62nd Shap. Visible in the photo exhibit significant color elements according to the standard scheme of camouflage in 1943, so it was used for reconstruction. On the upper surface of the spot of green, light brown and dark gray color on the bottom - blue. Red stars with white-red stroke. The digit "2" - black with a white stroke. Blue spinner and the band on the fuselage - the hallmark of the first 198 Shap painted only removable part of the cook. White canted keel ending signified membership in the 233rd shad. These color elements appeared in the division back in 1942 remains unclear, with nothing connected and when there was more light-colored plumage. Also typical for aircraft 233rd shad.