Marc, it don't must be an E-3. You can see the hatch for the MG 17 access on the wing. In combination with the early canopy I think an E-1 is more possible in my opinion.
The picture don't looks like a Photoshop manipulation. There are no typical artefacts around the emblem... very clean photo.
Btw, the Stab/St.G. 77 got Bf 109's from 31.3.41 to 6.41... source:
http://www.ww2.dk/air/attack/stg77.htm