Extremely RARE WW II Swiss Sitometer Artillery Compass Level

Description

Far as I can tell this is working fine   when I hit the release button the compass points to North. The dial on the bottom moves fine. Overall to me it looks like it's in pretty good condition. check the pictures let me know if you have any questions below some information I found online
Vintage Swiss Army Sitometer in original leather case. Developed especially for military use, it is a device in the form of a combined compass and level to define the angle and direction of artillery aim and rapid measurement of positions. From a design dating back to 1916. This small instrument is also ideal for obtaining a preliminary overview and carrying out reconnaissance. It allows the measurement of bearings (taken from magnetic North) and angles of elevation.
Precision engineered; alloy casing with brushed duralumin top, hinged metal lattice guard to the face and sapphire bearing mounted compass disk with spring locking mechanism to prevent damage during transit. Inscription on the top: Schussrichtung (Firing Direction), Zielpunkt (Target Point), Richtkreisschema (Aiming Circle Scheme). On the base the circular disk with rotating dial is inscribed with an arrow and the heading Richtwinkel (directional angle). Original label inside the lid of the leather case reads, 'Wichtig. Instrument genau horizontal halten. Das auge dicht an die linse bringen'; Important. Keep the instrument exactly horizontal. Bring the eye close to the lens.
Dimensions: (leather case) 8.5 cm/3⅜ inches x 6.5 cm/2½ inches x 3 cm/1¼ inches