Re: Excuse me ..
Not so. Bayerische Flugzeugwerke AG (known as BFW) was renamed Messerschmitt, after chief designer/new owner Willy, in 1938, so all post-1938 design prefixes changed from Bf to Me.
The Buchon design was based on the Me109G, which dates from 1942, hence it's an Me. It would be a Bf if it was a 109A-E, the first Me being the Me109F.
Here endeth the mid-20th-century German aircraft design nomenclature lesson.