Looks like a cp1

[Pen Ingeneer]

... but it is thicker, 9.4 mm in diameter and it has a Safari feed and nib. The rest is identical, with this solid clip. The barrel and cap is gently brushed stainless. Time of production: 1981 - 83.

I need to know because the inner cap has crumbled and I need a replacement.

Thanks

[christof]

There are two versions of the cp1. An early, slim one (on top in the picture) with 14 ct. nib and a later, thicker one with steel nib. Don't know the year when it changed.
C.

[Pen Ingeneer]

Hi Christof
the confusion is solved... What I have is the thicker version of the cp1... they used to be very strict with their naming policy... I assumed that they would call the thicker version at least a cp2 or something. I guess, they had reasons to hide the original design.

What is the other thing? looks like a 2000? IMHO, ugly.

Thanks for your reply and the photos