Yashica TL Super. A friend gave this to me a few months ago, but the lens was unfortunately covered in fungus. Bummer too as it's a 50mm f/1.4 with huge chunks of glass. A couple weeks ago I was talking to my friend Steve about it and he remembered that he had a lens with this mount. This one is a Rikenon 28mm, f/2.8. $10 later and I'm ready to drop some film in.
Oh, and this thing is really heavy.