Yours is a late 1959 early 1960 version. there is really not much to differentiate M2's once they stopped using the button rewind.
Only thing to look out for is a spare take-up spool. The Quick load is neither very quick nor is it that secure! I prefer the removable spool and this also allows you to carry a second spool with film already attached to it. Great way of "reloading" in the dark. Finding the slot in the quick load or on the centre spool in dim light can be frustrating.
There are a couple of things to check with M2's, does the "click" mechanism on the film counter work (it is not a big deal if it doesn't though. At the end of the film you cant advance anymore!). Also check that the film spool has enough "friction" that it wont slip and overlap negatives. It is rare, usually on VERY heavily used M2/M3's.
Are you starting off with a 35? This is where the M2 shines, a 35 and a M2 is surprisingly flexible and if you use your feet as a "zoom" ( a step back is a 28, a step forward is a 50 and two steps forward is a 90).
Good luck with it and enjoy it. In my humble opinion the M2 is the apex of Leica design. After that they started to add things like more framelines, angled rewinds, weird loading systems and even built in meters!