The Kaweco DIA was originally launched back in the 1930s, and has the unique design feature of knurling on the screw-on cap and barrel.
The Kaweco DIA 2 fountain pen is made of acrylic resin on CNC-precision-machined aluminium. The clip is made of gold plated brass. It measures 135 mm closed, and 160 mm with the cap posted. The German 060 stainless steel nib is available in 5 sizes from EF to BB.
The DIA 2 comes in a high quality box with a leatherette cover.