Swiss 18 carat gold open faced lever pocket watch Circa 1958

Gold keyless lever by International Watch Co.
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An elegant Swiss gold open faced keyless wind lever pocket watch, Probus Safusia, circa 1958. This watch has a polished 18 carat gold case and a silvered dial with gilt Arabic numerals. It also has an outer minute division, subsidiary seconds at 6 o’clock and gilt baton hands. The watch is equipped with a bridge movement with lever escapement and Glucydur screw balance.
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Diameter: 57 mm
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Weight: 76 g
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Signed: International Watch Co. Schaffhausen
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Glucydur is an alloy made of copper and beryllium. It is known for its exceptional strength, hardness and elasticity. Additionally, it is highly resistant to both corrosion and wear. Due to these features, it has numerous applications across various industries, including watchmaking, dentistry and aerospace. The development of Glucydur dates back to the early 20th century when Swiss watchmaker Paul Ditisheim was looking for a material that could be used to make watch springs. He required the material to be strong, durable and non magnetic. Glucydur met all of these criteria. As a result, it quickly became the standard material for watch springs.
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International Watch Company Schaffhausen is a well known Swiss watch brand specializing in luxury watches. It is renowned for its craftsmanship, precision and elegance. IWC’s motto is Probus Scafusia, a Latin phrase meaning ‘good, solid craftsmanship from Schaffhausen’. The motto was established in 1903.