This is the classic OLYMPUS OM-4. The body is completely junk. The winding lever doesn't move. The shutter doesn't fire. The body doesn't work. However, it comes with a rare data back for the OM-3 and 4. The grip is also intact. The front cap is also a relatively rare part. Consider the body as a bonus for these parts. The data pack uses mercury batteries. Since I can't get batteries, I haven't been able to confirm its operation. It may be broken. I've owned this since the film era, but it stopped working a while ago and I've left it unused. My older OM-1 still works, but the successors that advanced with electronics break down faster, and it's a shame that they can't be repaired. Please consider this for parts and display purposes. Thank you. As a postscript, the cover that hides the data back's switch opens easily. It feels like it opens on its own if you don't hold it down.