I have these claims for Jakobi in his Toni days:
06 Aug 1941: Hudson 30km north of Stavanger-Sola
11 Aug 1941: Blenheim 25km southwest of Stavanger
08 Sep 1941: B-17 75km southwest of Stavanger
On the last encounter Jakobi and his wingman Lt. Wolfgang Steinicke both made emergency landings with their Bf 109 T-2s as a result of combat with the Flying Fortress, which was AN525 WP-D belonging to 90 Squadron and the first-ever B-17 lost in combat.
Some details of the encounter can be found here:
https://books.google.co.uk/books?id=...jakobi&f=false