This is a Leicameter MC, which I used on my M3. It seems accurate compared to my Lumix G1. Condition is nice, but not perfect. There is a mark from where I assume a sticker used to be on the base, and a little scuffing on the metal.
It's a nice device, but for me, adds bulk to to the camera, which I don't like. Also, The way it works does not come naturally to me, and I ended up preferring a simple handheld meter.