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I believe that the RLM controlled the issue of the 3 digit blocks to the various manufacturers as well so that you could not have, for example, a Ju88 and an He88. All of the numbers are unique with a very few exceptions. The 109 and 190 numbers are purely coincidence.
Except for:There was no reuse of numbers.
When referring to a type (regardless of manufacturer), I try and stay as close as possible to the original spelling: Fw187, P-36, MB.150, IAR 80, etc.The whole Me versus Bf is a bit of a controversial subject and it isn't as clear cut as people believe it to be. Messerschmitt often used the prefix "Me" to describe the Bf 109 in in-house paperwork. Within this thread below of Bf 109 manuals there is a manual for the Emil described on its front cover as an "Me 109", look for "Bf 109e Handbuch":
New Bf-109 Manuals Thread
Ok, Ive never been happy the way I created this thread. So Im rebuilding it and adding more manuals. Sources of manuals translations and such Luftwaffe Cockpitinstrumente Homepage Titelseite Instrumente Gertebrett Baumuster The 109 Lair- The Online Source for Messerschmitt 109 information...ww2aircraft.net
Although Bf 109 is certainly the accepted definition, Me 109 is certainly not unacceptable (but Me-109 or Me.109 is! I read a magazine article once in a local publication that had three different ways of designating the aircraft! Consistency, people!)
Sometimes it's hard to keep track of all that stuff!
The "Me 109" manual was issued by Mtt itself, any official manual issued by RLM beared Bf 109 until the end
If we are going to be super accurate, then we should use periods in the manufacturer's designation, such as P.Z.L. and I.A.R. If we don't, we still know what is being described.