Vintage monocular (6x) in leather case. Case and monocular are both marked CARL ZEISS JENA. The monocular is also marked CALLAGHAN & CO. (Callaghan was a supplier of optical instruments).The seri al number is 267259. I believe this means it was made around the beginning of the First World War. Size 4.5" x 2.5" (11.5 x 6.5 cm) approx. Condition Vintage monocular, about a century old, and with no obvious damage. Scuffs and marks from normal use, especially on the outside of the leather case.
The item "Carl Zeiss Jena vintage monocular 6x leather case Callaghan & Co First World War" is in sale since Saturday, February 16, 2019. This item is in the category "Cameras & Photography\Telescopes & Binoculars\Binoculars & Monoculars". The seller is "braver*grace" and is located in Bristol. This item can be shipped worldwide.