Swiss extremely rare second Chronograph Rattrapante Circa 1970

Aluminium split second chronograph with lever escapement
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An extremely rare pocket watch with 1/10 second Chronograph Rattrapante (split second chronograph), made by Heuer in la Chaux-de-Fonds, Switzerland, circa 1970. The open faced plain case of this watch is made from blackened aluminium and the black and white dial has a red 1/10 second scale with a red pointer, white Arabic numerals for the hours with black and white hands, a subsidiary dial at six o’clock for the seconds and a minute counting dial at twelve o’clock. The movement has an extremely fine precision calibre with a split second function, a lever escapement and a high-speed oscillator.
Dial and movement are signed.
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Diameter: 65 mm
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Signed: Heuer Leonidas
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TAG Heuer S.A.

TAG Heuer S.A. is a Swiss luxury watchmaker. The company began as Uhren Manufaktur Heuer AG, founded in 1860 by Edouard Heuer in St-Imier, Switzerland. In 1985, TAG Group purchased a majority stake in the company, forming TAG Heuer. In 1999, the French luxury goods conglomerate LVMH bought nearly 100% of the Swiss company. The name TAG Heuer combines the initials of “Techniques d’Avant Garde” and the founder’s surname.