Undergoing Maintenance for the Bf 109 of JG 52

This Messerschmitt Bf 109G-1 "Weisse 10" (Werknummer 19881) of I.Gruppe / Jagdgeschwader 52 (JG 52) is undergoing maintenance by its ground-crew on an airfield at Gostagayewskaya, north-east of Anapa in the southern part of Heeresgruppe Süd (Army Group South), summer of 1943. We can see a Daimler-Benz DB 605 Engine on the open cowling, and also the RLM 77 Hellgrau camouflage pattern

Source:
"Luftwaffe at War: Fighters over Russia" by Manfred Griehl
https://www.ebay.com/itm/WWII-German-Luftwaffe-Color-Photo-Me109-Servicing-WW2-World-War-Two-Germany-/351694747688
http://thirdreichcolorpictures.blogspot.com/2010/01/messerschmitt-bf-109.html