Unique American gold 4 minute tourbillon watch Circa 1991

Tourbillon with constant force, moon phases and power reserve by Gene Clark
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An unique American 18 carat rose gold open faced four minute tourbillon watch with constant force, moon phases and power reserve, citca 1991. Gilt finished movement, 28 jewels, constant force escapement, Peto’s cross detent, four minute stainless steel tourbillon regulator with stainless steel balance and gold screws. Silvered engine turned dial, Roman numerals on eccentric silvered brushed chapter ring, blued steel hands, outer beady minute divisions, subsidiary seconds, aperture for moon phases above 12 and fan shaped sector for power reserve. Large case, milled band. Case, dial and movement signed.
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Diameter: 68.5 mm
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Signed: Gene Clark USA