Mark, hereby answering your mail:
My data is different, all german claims on 19.6.1943 between 1:50 and 2:05, location "37 Ost/20/4...", altitude between 100 and 600m:
2 x Boston (Oblt. Widowitz)
5 x Hurricane II ( Fw. Norz, Ltn. Diepen, 3x Uffz. Thomann)
4 x P-39 (3x Oblt. Widowitz, Ltn. Diepen).
All pilots from 9./JG5 except Norz who was in 8./JG5.
Do you know if the actual soviet losses were really so high?
Especially Widowitz' claims (2x Boston + 3x P-39 ) are "interesting" - he must have been a very good shooter.