Vintage Kaweco Dia 83 EF Fountain Pen

Description

Vintage Kaweco Dia 83 EF Fountain Pen.
Has not been tested.
We were cleaning up my grandmother‘s house and found it. I don’t know anything about fountain pens or how to fix them/make them work. I assume it’s authentic knowing the kind of things that they’ve collected over the years.
I think that the clip has broken off as shown (or I assume it used to have a clip), also I tried to unscrew the back and that plastic piece looks like it is broken, as shown. I assume it’s fixable but I have no idea. so currently it’s being sold in as is condition. Either way, very cool looking vintage piece.