Externally visible differences between Bf 109E-3 and E-7?

[Kuba Plewka]

Originally Posted by Kjetil Aakra

Note the round metal sheet covering the original MG 17 port.

It's interesting thing for me - in Erstatzteil-Liste from january '41 there's shown both - the cannon port with it's Trommel-bulge but also a MG 17 barrel hole (blinded, but visible) on the wing's leading edge. There is also a wing crane with both mount points, smaller for MG 17 and biger next to it for a MG-FF cannon. Was it standarised wing since the beginning till the end of Emil production?

You know for sure one photo of E-7 "white 12" of 7./JG 26 beeing rearmed with that blinded MG 17 barrel hole. It is not blinded with metal but a softer thing (fabric??) painted with darker colour (seems like red-brown primer for me).