The model no. 70/1 was created in the 1920s. This model corresponds to the larger variant of model no. 50/1. As with the 50/1 model, there were two versions, a low-cost (designated "cheap") version and a "high-quality" version. The group of inexpensive versions included pocket knives made of carbon steel with celluloid/ cellidor scales in red, black or white, as well as pocket knives made of rust-resistant steel with celluloid/ cellidor scales in ivory and imitation tortoiseshell. The high-quality pocket knives of model no. 70/1 were all made of rust-resistant steel with the scale material celluloid/ cellidor in imitation mother-of-pearl, horn, tortoiseshell, mother-of-pearl and engine-turned steel. The price difference to model no. 50/1 was small and amounted to CHF 0.30, for example for the version in carbon steel and red celluloid/ cellidor scales (cf. catalog 1936).
The model was offered from the 1950s with aluminum scales, ribbed in one color, smooth in one color or in one color with advertising lettering. Later they switched to nylon scales.
The model no. 70/1 has a large cutting blade. The model never came with a toothpick and tweezers, but it was available with a bail and later with a ring.
Large blade: 2.6 mm (later on Alox models: 2.0 mm); Rivet: 1.5 mm (later 1.6 mm)
The back spring also serves as a support for the cutting blade. It was riveted at the foot and in the middle. Compared to the 50/1 model, the center rivet is always visible, ie it was riveted over the scale.
Over time, the shape and structure changed only minimally. The middle rivet was moved to the middle of the back spring, finally only stainless steel was used.
Celluloid/ Cellidor was the main material for the scale, later aluminum in various colors was used.
The majority of the circuit liners are made of brass, with a small portion made of aluminium. In the variations with aluminum scales, the circuit liners were omitted.
Trade names: Sentry, Junior