Columbus 28 models were manufactured both as large button fillers and as shorter models with military clip.
Shorter Columbus 28 pens have a very sturdy and robust look and are characterized by a metal finish both on the cap and on the turning knob.
They are mostly found with wartime trim and steel nibs.
This Columbus 28 in blue pearlescent celluloid has instead a gold filled finish and a 14 ct Columbus nib.
The pen is in pristine condition and the color is perfect, with no traces of fading.