Kari,
Sadly, this excellent pilot passed away in 2001. I can recommend you Bernd Barbas, the expert of the JG 52, I guess, he can comment this particular plane.
In his II./JG 52 book, Bernd Barbas mentioned the Bf 109 G-10/U4 WNr. 610533 as shot down by AA fire and as a 100% loss on 3 March, 1945 (so again a different information). Düttmann's Bf 109 G-10 "Schwarze 1" (his usual tactical code) is appears at Neubiberg in the II./JG 52 history book on the page of 222 (below photo - but the tail section with the WNr is not visible)
I guess, the best way to ask Bernd Barbas - if you don't have a personal contact with him, you can reach him via the
www.jg52.de site's forum as well (he is not a registered member of the toch forum, according to my knowledge)