The German Dark series on Netflix has showcased very beautiful fountain pens over its run. I have managed to see all the episodes and I came across a very interesting looking one. I can't manage to find who is the manufacturer. If you have suggestions the comments are just below :)
The first fountain pen that I have spotted in Dark season 3 is the following one. A very interesting long and probably gold nib
Tha same fountain pen is featured later being used to write in a journal.