B15A...what do you know

Hi everyone, been looking at cloth jackets and am trying to broaden my knowledge of the B15 and B15a
I see Talon were used for the zips and assume Crown and also I have noted Conmar,were there any others used.
Do you know who the original makers were, have seen Werber, Hudson Garment Co and H Bernstein...anyone else add anything to the subject

Thanks