A puukko is a small traditional Finnish general purpose belt knife with a single curved cutting edge, solid hidden tang, and usually, a flat spine.
Military models of puukko were popular in the Russian criminal underworld under the name "Finnish knife" or finka since the 20th century. The modified version were among the models on which the Soviet military knife NR-40 was based and which was informally called "finka".
Modern "Sissipuukko" (Ranger / Commando Puukko) a puukko type field knife, for military use
Puukko from 1939-1940
A knife is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evidenced by the Oldowan tools. Originally made of wood, bone, and stone, over the centuries, in step with improvements in both metallurgy and manufacturing, knife blades have been made from copper, bronze, iron, steel, ceramic, and titanium. Most modern knives have either fixed or folding blades; blade patterns and styles vary by maker and country of origin.
A Bowie knife of pattern-welded steel
Characteristic parts of a knife
Morakniv carbon steel knife
Knife blade mass production