I´m not familiar with the footwear of the RKKA but there was something similar in use. They are not the exact period ones that I have seen so far. I`ve heard after the war they did make same style work boots. I have seen work boots with same style and they are usually pebbled black leather. These ones have brown pig skin. There is a stamp on the lining but it is unreadable. No markings on the soles. Any thoughts?