This is a very typical electrolytic capacitor from x-USSR. I believe the case is not standard outside of USSR.
That black rhombus you can see on the case is a good sign - this part at some point was deemed to be good for use in military equipment, so it might still hold its properties.
Check that yellow (white originally) rubbery insulator is still rubbery. And if it is, I'd leave this capacitor alone, if you don't have a good reason to suspect it is faulty.