Black Forest Pens Rhombus Minimo Fountain Pen - Brass

This pocket fountain pen starts with a solid brass body and takes away everything unnecessary. The result is a compact writing tool that extends to full length with a posted cap and fits comfortably in a shirt pocket or small notebook sleeve when closed.

The defining feature is the milled rhombus pattern that covers the barrel. Rather than smooth metal that can slip during extended writing sessions, you get a three-dimensional geometric surface that provides purchase without aggressive knurling. The pattern catches light differently depending on angle, creating visual interest while serving a functional purpose.

At 87 millimeters closed and 117 millimeters posted, this pen balances portability with usable writing length. The cap threads onto the barrel end securely, transforming the compact carry form into a standard-length writing instrument. Brass construction means the pen weighs 36 grams—substantial enough to feel serious in hand without fatigue during longer writing sessions.

The number 5 steel nib comes in fine or medium widths, allowing you to match tip size to your handwriting scale and paper preference. Steel nibs provide reliable everyday performance with less flex than gold but consistent line width and easy maintenance. The nib feeds from a standard international short or long cartridge, or you can use a converter for bottled ink.

Because this is bare brass, the finish will develop patina over time based on how you handle it and where you carry it. Some users prefer the aged look; others periodically polish the metal back to bright. Either approach works—the machined texture ensures grip regardless of surface oxidation.

German manufacturing means tight tolerances on the cap threads, nib alignment, and overall fit. The pen posts securely without wobble, and the cap seals well enough for daily carry without worrying about dry-out between uses. This is a tool designed for frequent use rather than display.