Oberst,
sorry to nitpick, but I've gone through all the pages of the publication you quote and there is no trace of a G-10 there (if you exclude the close-up of Hartmann next to his last (?) Erla-built G-10 on page 119, but it's of very low quality nonetheless...*).
Could you then precise your source for the photo of W.Nr. 610 583 ?
BTW, the plane doing the head-on low pass was the late G-6 W.Nr.166221 flown by Hartmann in late summer of 1944 and shown also on foot of the same page 111. Contrary to what the caption says, it had the aerial mast, only that in the early versions of 'Erla hood" the mast was part of the canopy, fixed to the rear rim and opening to the right with it.
*(here's a better though small version)
