Swiss observatory chronometer with power reserve Circa 1961

Brass deck chronometer with 54h power reserve by Zenith
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A rare Swiss observatory chronometer with power reserve, a COSC chronometer certificate and original guarantee certificate, circa 1961. The watch is stored in an oak deck box. It features a silver-plated dial with Arabic numerals, an outer minute-hour ring with 24-hour markings, subsidiary seconds, a power reserve indicator, and blued steel alpha hands. The brass 3/4 plate movement includes a lever escapement, a hack feature, and a large Guillaume gold screw balance. It was sold with instructions for winding and setting the bezel by NV Observator in Rotterdam.
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Dimensions box: 155 x 130 x 155 mm
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Signed: Chronometre Zenith
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Precision has always been the foremost priority at Zenith. Since its establishment in 1865 by Georges Favre-Jacot, significant emphasis has been placed on the adjustment of the base movements; this principle has remained unchanged in the creation of the iconic wrist chronometers, including the renowned El Primero with automatic winding. In the early 20th century, Zenith timepieces set numerous records in chronometer competitions and have amassed over 1500 accolades and honours for their high-quality precision watches. The current chronometer, featuring a unique winding mechanism achieved by rotating the bezel, is part of this line of technically flawless timepieces. The large chronometer balance and the distinctive fine-tuning are evidence of the high standards of the manufacturer, as is the overall design.
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The New Rotterdam Instrument Factory Observator N. V. was established in 1924, specializing in manufacturing and supplying measuring instruments for nautical purposes. Today, the Observator Group operates globally, providing a wide range of measuring instruments and sensors catering to nautical requirements and environmental measurements.