Ytargsillou,
I would suggest you to verify all Luftwaffe losses on those days ( check
www.jg300.de; JG 26, JG 1, JG 3, JG 4, JG 6 losses on that day. It is probable that the number you put there is part of the werknummer of the aircraft shot down. I do not have access to Luftwaffe ORBīs like so many here on the Forum, but there are several losses claims on sites ( not complete although ). I will try to have a look for you on what I do have. Please wait a few more days...It is indeed a very nice piece of collection! Keep it safe and well preserved. It would be nice for you to have all the backgrounds of this piece and the historry of the pilot as well.
Sincerely and friendly yours
Adriano Baumgartner