The LAMY cp1 is a thin, light pen that doesn't get as much fanfare as I feel that it probably should based on the number of people I know that love using this pen. Surprisingly it's one of the most popular pens that new Goulet team members choose as their personal pens (perks to working here!).
It's thin, only slightly larger than a #2 pencil. It's 17g, as light as a LAMY safari even though it's a metal pen. It has a spring clip and accepts all of the swappable LAMY nibs in extra-fine, fine, medium, broad, 1.1mm, 1.5mm, and 1.9mm stub italic. So if you already have another LAMY pen (except LAMY 2000) you can swap your nibs onto this pen.
With its straight lines and functional design, the LAMY CP1 is a workhorse pen that many of the Goulet team use as their daily writer. Personally, it's a little thin for me but I definitely see the appeal! I'd recommend this as a really good second or third pen. And you can get it in any color you want, as long as it's black!