French big verge pocket watch with four time zones Circa 1780

Silver open faced pocket watch by Le Roy
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A French rare and very big verge pocket watch with 4 time zones, circa 1780.
Silver plain case with French punch and casemaker’s punch JDM. Signed and numbered verge movement with central fusee. White enamel dial with Arabic and Roman numerals and 4 time zones. Movement and dial signed.
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Diameter: 60 mm
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Weight: 151 g
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Signed:  Le Roy a Paris
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The watch is a first version of a world time watch, as they were built 100 years later by many manufacturers. For pocket watches before this time you will usually find a maximum of 2 time zones, so this version is a museum rarity! We are only aware of one other watch from this period with the same complication. There, however, all time zones had separate movements. In the present movement, the complicated motion train is driven by only one movement, winding of the extra big fusee in center of the dial.