Swiss limited edition split seconds chronograph Circa 1985

Gold hunting cased split seconds chronograph by Edouard Heuer
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An extremely high quality Swiss 18 carat gold hunting cased split seconds chronograph with register, anniversary edition Ed. Heuer & Cie 125ème, circa 1985. Glazed movement, calibre Valjoux 93, high speed oscillator 36000 A/h, split seconds chronograph, signed Heuer Leonidas. White enamel dial with Arabic numerals, 30 minutes register and gold hands. Plain case, opened by pressing the lower pusher. Case, dial and movement signed.
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Diameter: 58 mm
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Weight: 162 g
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Signed: Ed. Heuer & Cie Switzerland 125ème
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Presumably these very expensive split seconds chronographs did not go into series production and were not sold. Only a few of these heavy chronographs exist and all of them are in unworn condition. Probably new-old-stock! Limited special edition, No 20.