Large Swiss silver open faced astronomical deck watch Circa 1860

Silver lever watch with five complications
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An extremely rare and large astronomical deck watch with five complications made by Le Blanc in Switzerland, circa 1860. The open faced case of this watch, which was crafted from silver, has a highly refined engraving on the back lid depicting a pair of lovers. The white enamel face has a compass at 12 o’clock, subsidiary dials for two time zones at 3 and 9, a calendar at 6 indicating the date and days of the week, and an outermost minute track with Arabic quarter hour numerals. The key wound movement of excellent quality features a straight line lever escapement.
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Diameter: 57.5 mm
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Weight: 131 g
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Signed: No name
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Comes with the original key.