Но вообще в тех делах сам черт ногу сломит. Если верить старушке Вики, то индексы Bf и Me до самого конца войны использовались вперемешку, порой даже внутри одного документа. А шильдики на фюзеляже, за редким исключением, несли индекс Bf вплоть до модели K-4.
Originally the aircraft was designated as Bf 109 by Reichsluftfahrtministerium (German Aviation Ministry, RLM), since the design was submitted by the Bayerische Flugzeugwerke (literally "Bavarian Aircraft Factory") company. However, the company was renamed Messerschmitt AG after July 1938 when Erhard Milch finally allowed Willy Messerschmitt to acquire the company. Subsequently, all Messerschmitt aircraft that originated after that date, such as the Me 210, were to carry the "Me" designation. Despite regulations by the RLM, wartime documents from Messerschmitt AG, RLM and Luftwaffe loss and strength reports continued to use both designations, sometimes even on the same page.[30] All extant airframes are described as "Bf 109" on identification plates, including the final K-4 models,[31] with the noted exception of aircraft either initially built or re-fitted by Erla Flugzeugwerke, which sometimes bore the Me 109 stamping.