Soviet KL-1 pocket watch slide rule 1950 USSR

This tool is an interesting integration of a working slide rule and a pocket watch type case. It was made in the USSR and marked by the maker but there is no brand name. This is the type KL-1 that was made by several companies, probably somewhere in the 1950’s. There is a scale on every side that work together. On one side the scale can be turned with the black button to match the fixed cursor on top. The centre red hands can be set simultaneously with the red button. The outcome can thus be read on the other side. It is fully functioning but has some small signs of use and age (one dial face is a bit darker). It measures only 5 cm or 2 inches in diameter.