Below you will see photos of a lovely Geha fountain pen with a striped barrel that bears a strong resemblance to some older Pelikan pens. The body is nearly identical to a 120 M&K that I have (slightly shorter body, slightly longer section, ends up being about exactly the same length). The cap is longer, about the same as a 400nn that I have, although this pen must be a little thicker than the 400nn because the cap for this pen is too big for the 400nn. (Yes, I tried it, carefully.) (No, I have that wrong, both barrels seem too small for the other pen's cap.)
The only markings I can find are on the clip ("Geha" in a circle) and the nib ("Geha" in a circle, and "14 K 585" underneath). It is a piston filler.
So I have the usual questions: does anyone know what model this might be, and what era it might be from?
Perhaps a more urgent question is, what is the little green tab in the feed for? I hope you can see it in the enlarged photo of the feed. It looks like it would press down lengthwise towards the section, or possibly straight into the feed. I don't want to try anything until I know how to manipulate it and what it's for. Thanks in advance for your help.
Edited by Paul-in-SF, 23 May 2020 - 00:03.