Many thanks for showing the “B35” marked charger, I’d not seen one before.
My “A37” one is shown in my November 3rd post and is just like yours except the marking on mine is more faint and the nickel plate is lifting.
As for the 5E/5F conjectue I’m not well place to judge. I only have a 5E/40 and that’s clearly stamped with a dark grey phosphate finish. Without a 5F example in my hands it’s difficult to judge from the pictures, all the more so by the lower edge of the marking running into the stiffening groove.
Edit … what is interesting is the different styles shown on the same marking, my 5E/40 is quite unlike Norbert’s which makes me think of two different bunters and maybe quite a large production run … but these weren’t just marked 1940, they were also marked 1942 and that’s a scarce year for German clips, with only three makers; “EXQ”, “DZA” and “GHX” known to me. In comparison there were 14 in 1941 and 11 in 1943.
I don’t suppose we’ll ever know who these differently marked chargers were made for, or why, but does anyone fancy making a guess ?