Hi bcy,
That one looks fine, assuming that the movement is OK (should be 2628H). In particular, the dial and the day/month wheel match (ie, they are both in English and not mismatched with one Russian and the other English).
To set the date, you pull the crown out slightly further than you would to set the time - each pull and release will advance the date by one. To set the day of the week, though, you just have to wind the time forward. Normally you set the day of the week first, then the time, then the date.
Do you know how to use the perpetual calendar? You align the year and the month in the bottom window, then the top window tells you the days of the week. So, in your photo, for example, 1989 is aligned with March (bottom window), so the 1st, 8th, 15th, 22nd and 29th of March 1989 are Wednesdays (from the top window), 2nd, 9th etc are Thursdays... Your year wheel only goes up to ?1991?, but the years repeat so you should be able to work out which year is equivalent to 2013. I think the "Feb" and "Jan" in white are for leap years.
The caseback is a press-on one. There will be a little groove in the body, opposite the main crown, where you can insert the tip of a knife to lever the caseback off. Just be careful to hold the knife in such a way that, when the caseback pops, the knife does not slip and go into the movement. The caseback can be replaced by hand pressure alone (just don't press hard on the crystal, in case it cracks).
Enjoy!
Paul