Swiss aluminium 1/10 second chronograph rattrapante Circa 1970

Blackened aluminium chronograph rattrapante by Heuer 
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An extremely rare Swiss blackened aluminium 1/10 second chronograph rattrapante, circa 1970. Very fine precision movement, calibre Valjoux 93, split-seconds, high-speed oscillator. Black and white dial with Arabic numerals, red 1/10-second scale and red hand. Plain case, the back with Czech deployment marking -13- 2., the inside signed by the watchmaker and with serial number 129288, stainless steel protective back. Dial and movement signed, Comes with the original box.
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Diameter: 65 mm
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Signed: Heuer Leonidas SA Swiss made