Leitz 400mm f6.8 Telyt-R for Leica R

The Leitz Telyt-R 400mm f6.8 lens is a simple telephoto lens for Leica R mount cameras. Simple, as in it has push-pull focusing- not a helicoid- and a simple achromatic doublet lens. Yes, it is literally a tube with a doublet at the end. But also, it's a Leica, so it can't be that bad (it's not that bad at all). In very good condition, with minor internal dust and a slight ding in the filter ring.