Swiss 18k gold minute repeating carillon pocket watch Circa 1920

Gold lever repeating on four gongs with four hammers 
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A fine and very rare Swiss, 18K gold, a keyless hunting cased pocket watch with carillon minute-repeating on four gongs, circa 1920. Made by Henri Barbezat-Bôle, Le Locle, movement by Constant Piguet, Le Sentier. A polished case, hinged gold cuvette. White enamel dial with Breguet numerals, outer minute divisions, and subsidiary seconds. Blued steel Breguet hands.
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A gilt brass movement, 29 jewels, counterpoised straight-line lever escapement, cut bimetallic compensation balance with five adjustments, blued steel Breguet balance spring, index regulator, repeating on four gongs with four hammers activated by a slide on the band. Movement and cuvette signed movement punched with partial Constant Piguet patent number. Property of a Hong Kong Collector.
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Diameter: 54 mm
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Signed: Henri Barbezat-Bôle  Le Locle
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Carillon minute repeating watches are very rare; only a few are known with four hammers or Westminster chimes. On March 20, 1896, Constant Piguet patented this system of minute-repeat with the carillon, under the No. 11948. The makers that specialized in this type of watch were Constant Piguet, Eduard JeanRichard, and Victorin Piguet. The known tunes played by four hammer carillons are Westminster chimes, the Swiss National anthem, and God Save the King.
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In 1896 Constant Piguet is listed as being a gong maker in Le Sentier in the canton of Vaud, making carillon repeating watches with four hammers. On March 20, 1896, Constant Piguet patented this system of minute-repeat with the carillon, under the Swiss patent No. 11948. These watches are those for which he is best known today and bear his patent number on the movement.