Sovjet Unie - Sovjet-chronometers

Fully functional stopwatches, one is a single-button stopwatch that starts, stops and resets with one button, both in excellent condition.
Presumably from 1960s/70s, made in Russia, 15 rubis movement,
with English engravings, perhaps they were made for export.
Just a few small signs in the part where you can open the case back, as highlighted in the photos. The measurements are different, one 5.5 cm and the other 4.5 cm.
The certificate is only for the larger one.
Safe and fast shipping with protective packaging.