[Recceswind]

Hello,

I would like to ask about correct designation of the early versions of Klemm aircarft.

Is it correct to write:
Klemm L.20 B I,
Klemm L.25 Ia
Klemm L.25 b
Klemm L.26 a II
???

What does "B I" (or "BI"?), "Ia" (or "I a"?), "b" ("B"?), "a II" ("aII"?, "II a"?) stand for?

Thanks in advance!