$150 · Zeiss monocular with case

Nice Carl Zeiss Jena monocular, complete with leather case. This monocular 6x30 is in excellent condition,with no scratches on the glass or haze inside, very sharp and bright image. Very handy for in the field, or for a collection. Serial Number 1333822. I estimate it dates from the 1920's but cannot be sure as the zeiss serial number listing states binoculars.