This is a Leica (E. Leitz Wetzlar) 13.5cm viewfinder [SOOYV]. It's a rare item that's not often seen. It shows signs of use over time. There is some peeling of the silver coating, but it does not affect the view. The parallax correction is in meters and works without issue. The original dedicated leather case is very clean, and the viewfinder fits perfectly. Leitz products from this era are truly exquisite, and even such a small item has a very precise feel. Even the case is very well-made, and the fit is perfect. This is a Leica product that provides a sense of satisfaction just by owning it.