Swiss limited edition split-seconds chronograph Circa 1985

Gold hunting cased split-seconds chronograph by Edouard Heuer
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A Swiss very fine, heavy hunting cased pocket watch, Valjoux “Heuer Leonidas“, with split-seconds chronograph, circa 1985.
18 carat gold, tiered, polished case with reeded band and pusher for chronograph at “2” and “4”. Signed enamel dial with Arabic numerals, auxiliary seconds at “9”, 30 minute counter, split-seconds chronograph and gold Louis XV hands. 1/2 plate movement, rhodium-plated, ground, with two adj., seventeen jewels, finely ground and bevelled chronograph steel parts, ratchet wheel, glazed movement, Glucydur balance and a Glucydur lever and escape wheel.
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Diameter: 58 mm
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Weight: 162 g
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Signed: Ed. Heuer & Cie. “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.
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Valjoux (for Vallée de Joux, “Joux Valley”) is a Swiss manufacturer of mechanical watch movements. It is known primarily for chronograph ébauche movements that are used in a number of mid- to high-range mechanical watches: The company has been a part of ETA for a number of years and is a member of the Swatch Group.