When operating the first model of the knife, its essential drawback was revealed - the non-separable design practically did not allow to clean the knife after contamination in the field. This flaw was removed in the next model - "M-1937 / II" (Type II FKm), which was produced from 1941 year to the end of the war. In addition to the above companies, knives were also manufactured at the enterprises of other companies, including the company "E. A. Heibig". The main difference of the second model is the ability to quickly disassemble the knife into its components for cleaning it or replacing the damaged blade with a new one. Moreover, to perform these operations, no special tools were required.  * [Additional screenshots](http://www.artstation.com/artwork/q9gwVP) * [First type of knife (M-1937/I)](http://skfb.ly/opFtw) * [English experimental knife](http://skfb.ly/opHt6) Source: Objaverse 1.0 / Sketchfab