This is vintage Soviet split chronometer/stopwatch Slava.

This model was really used for space flights in USSR (please see the last image).

It was made in USSR in 1970s at the 2nd Horological Factory.

Its measuring unit is 0.1 sec. 

It can measure up to 30 minutes. 

Case diameter (with no crown and knobs) is 64mm. 

Watch thickness is 24.4mm.

Weight is 230 grams.

The movement contains 20 ruby jewels. It is mechanical and needs to be wound. 

 The watch was serviced by a professional watchmaker recently. 

Runs well and keeps time accurately. The watch is used.

SHIPPING 

 I ship worldwide for $25. The item will be packed very carefully.