Unlacquered aluminium pocket fountain pen in the AL Sport silhouette. The raw metal will oxidise with use — a writing tool that ages like a machined object.
Also at Fig.1: https://www.fig1.co.uk/kaweco-al-sport-fountain-pen-in-raw.ir
Germany · Est. 1883
Heidelberg pen house known for pocket fountain pens in brass, aluminium, and plastic.