Swiss watch with two time zones and centre seconds Circa 1870

Silver Seconde Foudroyante pocket watch with a thermometer
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A rare Swiss gentleman’s pocket watch with two time zones, quarter jumping seconds Seconde Foudroyante and thermometer, circa 1870. The silver engine-turned case features an engraved monogram AG and a reeded band. The enamel regulator dial displays two time zones with radial Roman hours, a 1/4 seconde foudroyante, jumping centre seconds, and an arched thermometer at 12, which provides temperature indications in Reaumur ranging from -10°C to +40°C. The dial also features blued Breguet hands and bears the signature of Reaumur. The movement is florally engraved and is key-wound, with a Montre-Chinoise Lepine calibre, duplex escapement, and a steel balance with blued steel wings.
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Diameter: 49 mm
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Weight: 59 g
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Signed: No name
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Foudroyante (jumping seconds or hand) (flying seconds)
On a Chronograph, a hand that makes one rotation every second, pausing four, five, or even eight times to indicate quarters, fifths or eighths of a second. Also called foudroyante.