Model No. 42 has a large and a small blade and a long nail file on the back.
Big blade: 2.2 mm; small blade: 1.5 mm; Nail file: 2.2 mm
The model is slimmer than model no. 40, the small blade is significantly narrower because the nail file was riveted on the opposite side. The central head rivet remained.
When mother-of-pearl was used as the scale material, the rivet that held the back spring in place was hidden under the scale. This type of hidden rivet does not work without circuit liners.
Tortoiseshell, stainless steel, horn, mother-of-pearl and imitation mother-of-pearl were used as the scale material.
The liners, as well as the rivets, are made of nickel silver.