[sidney]

Hi again Leo, you are most welcome

I believe that among others you might be referring to John Weal's book BF 109D/E Aces 1939-1941 (Osprey Aircraft of the Aces No 11), where, if I remember correctly I./ZG 2 was referred to as JGr. 102 already during the campaign against Poland.

The dates that I gave in my response to your query were derived from Prien, Stemmer and others series of books JFV der Deutschen Luftwaffe 1934-1945, Part 2.

I would go with the latter reference.

Regards,
Sinisa