Swiss silver split second chronograph pocket watch Circa 1890

Silver lever with 30-minute counter
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A Swiss silver split seconds chronograph keyless pocket watch, circa 1890. A polished case back with split seconds, activated by the olive-shaped push piece located on the case band at 11 o’clock, 1/5 second chronograph, activated by the single round push piece located on the winding crown and instantaneous 30-minute counter at subsidiary dial at 12 o’clock. White enamel dial with suspended Arabic numerals, subsidiary seconds at 6 and yellow gold Louis XV hands. A gilt brass movement, going barrel,  straight line equilibrated lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator; chronograph work and split seconds work on the top plate. Movement stamped by J.P and the dial is signed with Decimal, the name of the model.
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Diameter: 53 mm
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Weight: 121 g
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Signed:  No Name
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Accompanied by a copy of the invention patent.
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Movement based on the Swiss invention patent No. 359, delivered on January 12, 1889, to A. Lugrin, L’Orient-de-l’Orbe, Vallée de Joux, for improvements in the construction of chronograph counters. The company A. Lugrin & Cie was founded in 1884 by Alfred Lugrin (1858-1920), a young watchmaker who worked for LeCoultre & Cie (1879-1884). This company will become Lemania.
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This patent is used in particular by the horological factory of Jules-Frédéric Jeanneret of Saint-Imier (Bernese Jura), founded in 1866 and continued after his death (1890) by his widow, then his sons, under the name Albert Jeanneret & Frères. This company became the Excelsior Park company. Watches with or without split seconds are known to have been made with this patent and sold by S. Smith & Sons, London.