[Draken152]

Thanks for answer REVI16. I positive identified REVI 3a/b on the pictures of FW 56 and in manual for AR 68. I know there are some pictures of revi 3 in Bf 109 but in manuals for versions B,C,D... is REVI 12 as standard. But what I need is info about Ar 64 and 65(and picture of HE 51). I think you are right Revi 3 series was used starting by year 1934(in case of he 51), probably 1935(in case of Fw 56), but it is only guessing.
If we know what type of gunsight was used in Ar 64(in service from summer 1932) and Ar 65(in service from 1933) we can be sure.
I know the manual for Ar 65 exist...Please can someone help me...