The Rodenstock Eurygon 35mm f4 lens is designed for use on an enlarger or on bellows. So while it has a Leica thread mount, you can’t just mount it directly to your camera and expect to get a useful result: everything will be out of focus, and there’s no way to focus it. So please: enlarger or bellows. In excellent condition, with clean glass and minor wear on the diaphragm blades that will not affect function.