Penol’s N-series of pen, ranging from the 0N to the 3N were made in the early 1940s. This 3N, made in Denmark in either 1940 or 1941, is an example of Penol’s “Aëro” design, which has a transparent portion at the top of the barrel aligned with a transparent portion of the section. This means that you can have an ink window in a button-filler with a latex ink sac.
Total weight: 15.5 g
Body weight: 9.1 g
Total length (not posted): 117.5 mm
Total length(with cap): 128.3 mm
Barrel max diameter: 11.9 mm
Cap max diameter: 13.7 mm