Erwin Sattler precision pendulum clock with monthly rate, model 1900, brass precision movement with weight train over strings, 4 ball bearings and 12 jewel bearings, partly screwed into chatons, contra-winding and Graham escapement with sliding...

Erwin Sattler precision pendulum clock with monthly rate, model 1900, brass precision movement with weight train over strings, 4 ball bearings and 12 jewel bearings, partly screwed into chatons, contra-winding and Graham escapement with sliding steel pallets, rate 1 month, invar steel seconds pendulum system "Riefler" in the shape of a gilded brass cylinder, silvered amplitude scale at the bottom, silvered regulator dial with etched black numerals and Arabic minutes, small Roman hour and Arabic seconds, sign. "Erwin Sattler München", num. "No. 44", blued steel hands, winding aperture in the centre of the hour hand and solid gilded brass bezel, black lacquered wooden case, half-cylindrical glazed, circa 1990, limited edition of 100 pieces, 142x31x23cm, no guarantee on movement and functionality