Exact age is unknown buts looks to date mid to late 1800s, its unbranded with no hallmarks or makers marks, was with a job lot of pocket watches purchased from America. Fitted with dome shaped glass, the outer case is 50mm in diameter, the inner 40mm, the front & back are both hinged & may need tightening up, both are easily opened, metal has surface wear and some small plate loss, glass some minor wear & scratches. You will receive this item exactly as photographed. Please see photos for details. Thanks for Looking!