French gold pivoted detent watch with tourbillon Circa 1877

Gold full hunter with pivoted detent escapement by Papon
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A very fine and rare French gold hunting cased pocket watch with a one-minute tourbillon, circa 1877.
18 Carat gold, engine-turned, à goutte case with engraved gold dome: Papon à Bordeaux, Chronomètre, Echappement tourbillon à Ressort et Bascule. Repos. Levée & douze Trous en rubies. Balancier compensateur, Spiral Breguet, case maker’s punch mark DG, and reeded band. Signed enamel dial with radial Roman hours, auxiliary seconds, filigree gold flower hands with set diamonds, and seconds hand shaped like a feathered arrow. Signed, stripe decorated, silver German movement with optionally key winding or crown winding, barrel, anti galop system, finest mirror-polished tourbillon steel cage of Guinard 2 type, pink gold train, screwed gold chatons, wolf teeth winding wheels, pivoted detent escapement, gold screw compensation balance, and blued Breguet balance spring.
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Diameter:52 mm
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Weight: 161 g
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Signed: Papon à Bordeaux
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Tourbillon
In horology, a tourbillon is an addition to the mechanics of a watch escapement to increase accuracy. It was developed around 1795 and patented by the French-Swiss watchmaker Abraham-Louis Breguet on June 26, 1801. In a tourbillon, the escapement and balance wheel are mounted in a rotating cage, in order to negate the effects of gravity when the timepiece (thus the escapement) is stuck in a certain position. By continuously rotating the entire balance wheel/escapement assembly at a slow rate (typically about one revolution per minute), the tourbillon averages out positional errors.