Swiss steel open faced split seconds chronograph Circa 1953

Like new pocket watch with silvered dial
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A split seconds chronograph pocket watch, made by Longines in St Imier, Switzerland, circa 1953. The numbered open faced plain case of this watch was crafted from steel and its silvered dial features an outer ring with black Arabic five minute numerals, black Arabic hour numerals, a subsidiary seconds dial at 6 o’clock, a 30 minute counter at 12 o’clock and blued steel hands. The numbered movement features a precision lever escapement, a split seconds chronograph, a Glucydur balance with screws and 21 jewels.
The case and movement have matching numbers and the dial and movement are signed.
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Diameter: 66,5 mm
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Signed: Longines
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Glucydur
A Glucydur balance is the timekeeping component in a mechanical watch, known as a balance wheel, made from a special beryllium bronze alloy called Glucydur. This beryllium copper alloy is highly prized in watchmaking for its excellent dimensional stability, resistance to temperature changes, durability, and non magnetic properties, all of which contribute to a watch’s accuracy and reliability.