[Sturmbock]

(*) In September 1938 the Bayrische Flugzeugwerke was renamed to Messerschmitt. The RLM (Reichs Luftfahrt Ministerium, German Air Ministry) and the Wehrmacht changed the abreviation from 'Bf' to 'Me'. The manufacturer continued using the 'Bf' for aircrafts in production. Since then the 8-109 was built as Bf 109 and used as Me 109."

"...Bayerische Flugzeugwerke was reconstituted as Messerschmitt AG on July 11th, 1938, with Willy Messerschmitt as chairman and managing director. The renaming of BFW resulted in the company's RLM designation changing from Bf to Me for all newer designs after the acquisition date. Existing types, such as the Bf 109 and 110, retained their earlier designation in official documents, although it came to overlapping, most often by subcontractors. In practise, all BFW/Messerschmitt aircraft from 108 to 163 (not the same plane as the Me 163) were prefixed Bf, all later types with Me..."

From: Messerschmitt and Obb. Research institute