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Hello

The denomination Bf.109 B-1/B-2 does not exist....it's Bf0109 A and Bf.109 B.

First "abschus" with a Bf109 A:6/4/37 (Lützow a Curtis;probably actually a Letow S.231)

First "abschus" with a Bf.109 B:27/08/37(Harder)

After the arrival of the Bf.109 B,the surviving Bf.109 A were upgraded (autumn 1937)
The significant changes were the installation of a metal,variable-pitch propeller and the replacement of the removable cowling sections with Bf.109 B-type incorporating cooling vents.
The surviving examples of the Bf.109 A were indistinguishable from the Bf.109 B

Top "Abschusse" Bf.109 A:6.10 (15),6.16 (7:Fleischmann=3,Oesau=2)

Lützof=5 with Model A
Pingel=5 with Model A
Boddem=8 (+2 unc.) with Model A
Fleischmann=3 with Model A (6.16)
Radusch=1 with Model A
Höness=3 with Model A
Ihlefeld=2+ with Model A
Oesau=3 with Model A (1 with 6.6,2 with 6.16)
Flegel=1(+3 unc.) with model A (6.7?)

Regards
Michel