The No. 1 model existed throughout the production period of the farmer's knife. This was the simplest version with 1 cutting blade. At the beginning of production there were different variants. Model No. 1 was designated when the scale made of fiber was installed throughout without metal bolsters. Then there was a variant with an eyelet on the pocket knife base, which was called Model No. 2. A variant with metal jaws was also considered model no. 2. From the 1930s at the latest there was only model no. 1, no model no. 2, and this model had no eyelet and always had metal jaws.
The model designation here is very confusing as it is not used strictly like the other farmer's knives (ie 4/1, 3/1, etc.). In addition, model no. 1 was not only available in 4, but in 5 sizes. The smallest size was designated as model No.5. This is confusing as there was also a No.5 peasant knife. Later, the No.1 model was called the No.1, No.2, No.3, No.4, or No.5 model, depending on size.
The smallest peasant knife of number 1, the number 5, was sometimes listed in the catalogs under the student knives, together with the numbers 50 and 70. It was 88 mm in size. Its back feather differed from the other sizes. It ended below the foot rivet.
Pocket knife No.1 had a large cutting blade. There was an optional hanger for this model.
Big cutting blade: 2.3 mm – 2.8 mm
On model No.1 and No.2, the head rivet held the large cutting blade in place. Two more rivets attached the scales and back spring.
Victorinox originally used black fiber scales as the material for this pocket knife, later also class I and II horn and red fiber instead of black fiber. The variant model no. 5 was only available with red or black cellidor scales.
The rivets and liners were made of steel or brass, the jaws of steel or nickel silver, depending on the version. The high-quality, called "fine version", used rivets and liners made of brass as well as jaws made of nickel silver and rust-resistant steel for the tools, if this was already available.