I have recently came across this thread:
It caught my attention. Not that I particularly like the pen, but I like the differences between first generation and the pen that is still in production today.
So I went to my “collection box” and found this:
And it made my day. I knew I had a cp1, but I believe that this pen is the first generation LAMY cp 1black - modell 58 with the original convertor J The 58 model is not on sale anymore, if I am correct. Seems like a gold nib as well.