John Seaman , Oct 25, 2012; 11:00 a.m.
It's not really an OM2 at all, having a fixed flash shoe unlike the rather fragile removable shoes of the earlier OM's. There's a secondary mirror under the main mirror which causes rather an odd sound when it flips up. I'm not sure what it does. The lever around the light on the front controls the self timer and thankfully switches off the beeper.
Heres the top of the camera, it's quite simple really. The button on the side of the lens mount is for illuminating the viewfinder display.
Top of the OM2SP