Hello Christian,
Good observation and a most interesting one:
- first of all, this Me410 is a A-1
- secondly, when this Me410 had belonged to KG 51, one of the units operating Me410's at night, it is more likely that it had the unit code of KG 51
- so far I never could have traced any pictures of Me410's from the Erprobungskommando 410, a detachment operating Me410's from Venlo airfield in WW-2. As EKdo 410 was an alias for the Me410 in the 1./NJG 1, we know from Flugzeugbestand- und Bewegungsmeldungen of the I./NJG 1 that this nightfighter Gruppe had also some Me410's, according to logbooks however with the unit codes of the 1./NJG 1: G9+_H, not any Stammkennzeichen recorded.
Therefore, one could suspect that this SI+KW belonged to a Luftbeobachterstaffel 7 for instance which operated in southern Germany.
All the best, Marcel Hogenhuis
www.fliegerhorst-venlo.net