Soviet KL-1 pocket watch slide rule 1967 anniversary 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 with the “sunrise” brand name. This is the type KL-1 that was made by several companies, this one was specially made for th 50 year anniversary of he Soviet Union in 1967. 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, in great condition and still has the original dated manual as well as the original pouch. It measures only 5 cm or 2 inches in diameter.