..this Gustav has apparently just been ferried in to JG 300, location unknown - other views in the series show a background of pine trees and note the Fw 190 nose left. Note 'TS +..' Stkz and the mid-fuselage (yellow) band (recalling the 'infamous' 'TS+MB' machines). The 'tall tail' with typical late-war finish, looks to be a replacement item.
The inscription adjacent to the fuel filler triangle reads " W=12 ", also repeated on the front face of the prop blades.. click on the image to view large.
I./JG 27 gunboats at Fels am Wagram defending the southern borders