Victorinox 91mm

In 1897, six years after he first started manufacturing the Soldier's knife, Karl Elsener brought out his Officers' Knife. This knife introduced the legendary corkscrew, some consider to be the defining tool of a Swiss Army Knife, and the secondary blade, in a new frame size - 91mm. The knife was the ancestor and equivalent of today's Spartan.
These Officers' knives, however, have never been issued to army officers or been part of a military contract, although they were designed to be attractive to an officer with its corkscrew. An officer could purchase a knife with his own money.
Strangely, however, the Officers Knives have been the quintessential Swiss Army knives for the public at large once they spread beyond the military.
The knives originally just had model numbers such as 246fmaU (- an early 'Champion') - until the descriptive names in the list below were introduced in the mid seventies.
The 91mm knives offer the most variety in tool configuration, and have been used in industries from Farming to Space Exploration.