USSR usually used own design of cases, modules, boards and chips.
Here the sample of late USSR watch with design very common to Casio. Case and module are fully interchangeable with Casio watch. The watch wasn't in production, only a few watches are known with partial functionality. The watch below produced in august 1991.
Anyway inspite of the fact it looks like Casio, it has its own chip with original set of functions, own display design.
So there are pics of watch in different modes. I cannot check some of them because of one button's malfunction.
It has modes: TIME, Rhytm, STW, Pace and some sort of Test (no idea). The watch has inscriptions on the case Electronika 60, Test stopwatch, sport signal.
The proof of the pudding is in the eating...