Swiss masterpiece watch with a perpetual calendar Circa 1933

Gold pocket watch by Ecole d’Horlogerie Le Locle / J. Blanc
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A complex Swiss graduate’s work masterpiece with a perpetual calendar, circa 1933.
18 Carat gold, polished case with gold dome and a pusher for separate switching of the months at 1. Silvered dial with Arabic numerals, auxiliary seconds, three subsidiary chapter rings for indications of the weekdays, months and date, cobalt blue enamelled golden moon phase disc with gold moon and stars, a window for leap year, and blued Breguet hands. Signed, rhodium-plated, ground bridge movement with wolf teeth winding wheels, finest steel parts for the calendar, gold screw compensation balance, fine adjustment via a threaded rod, and counterpoised Moustache lever.
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Diameter: 50 mm
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Weight: 101 g
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Signed: Ecole d’Horlogerie Le Locle / J. Blanc, Les-Ponts-de-Martel
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This extremely complicated and unique calendar mechanism has an integrated buffer system for the highly complex switching process and is operated through an eccentric wheel that applies even pressure on the main control lever and its tension spring. The switching operation for all indicators is activated every 24 hours. A central adjustment can be executed by pressing the pusher in the crown. A pusher at 1 adjusts the month in the calendar separately.