Puma Set Evolution

The evolution of the knife: 

The eventful history of mankind is inseparably linked to the development of cutting tools. Due to the different developments of different tribes, the transitions of the eras "Stone, Bronze and Iron Age" are fluent as well as temporally staggered. Blade weapons, however, found their way into every culture and also served - often with elaborate decorations - as status symbols of their respective owners.

From the very beginning it was vital to have the tools to produce food and clothing. For this purpose, hunted game had to be cut up and its components processed. In the beginning our ancestors used sharp-edged stones. By carving flint stones, the first "knife", the hand axe, was produced. This could be used for cutting, scraping, splitting, sharpening and as a weapon. Man had thus reached a stage of evolution in which he could use a tool he had made himself in a purposeful way. In further development, humans succeeded in mining and processing metals. Copper was first used to make knives. It could be poured into moulds by heating and then be processed.
This new melting process made it possible to produce complex shapes so that blades and handles could form an integral unit. However, the cutting tools were not hard and robust enough to do all the work that was required, so stone tools were still used. In the following period, however, it was possible to add a little tin to the copper and thus produce bronze. This now possessed excellent characteristics and completely replaced stone as blade material. The melting and refining of iron ore finally led to the production of iron and later - by adding carbon - steel. The compaction and attainable hardness of the material could be controlled by forging and subsequent heat treatment, so that wear resistance and durability were optimised. It was now possible to produce longer blades, for example for swords, which were both hard and flexible.
The PUMA set "Evolution" consists of the models "Stone", "Bronze" and "Iron

Abstractions based on historical models made of 440C stainless steel hardened to 56 HRC