This is an original Leica Mount (incl. rear cap that it interfaces with) for R series cameras. Use this to convert Nikkor or other brand of lens to Leica R-mount. Can also be used to replace damaged lens mount. Service must be performed by competent technician. I will take no responsibility for anyone adapting their non-Leica lenses without adequate experience and knowledge. A nice opportunity to convert a classic lens to R-mount...!
$50 plus shipping - located in California