A late 19th Century Swiss mystery watch in a silver double sided case. The gilt cylinder movement relegated to the crescent shaped portion of the watch between the glass dial and the pendant. Keyless with going barrel, the crown turning in one direction only. Small plain three arm gilt balance with blue steel spiral hairspring, polished steel regulator. Polished steel cylinder, steel escape wheel. Glass dial with gilt Arabic numerals, and minute ring, decorative engraved silver masks. The blue steel hands are driven by a glass disc which has a toothed brass wheel attached to its outer edge engaging the train. The miniature motion work for the hands is set between another glass disc and the dial. There is no provision to set the hands apart from moving them manually, which is common in these watches. Plain silver case glazed back and front. Rectangular button in the band to release the sprung front cover, silver crown and bow.