German repeater with alarm and Grande Sonnerie Circa 1780

Silver coach clock by Johann Martin Horn
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A rare, large Southern German coach clock with hour and quarter-hour self strike Grande Sonnerie, hour and quarter-hour repeater and alarm, circa 1780.
This unusual carriage clock in a silver case decorated with tulips has sound holes and a rear bell. The finely finished, silver, champlevé dial, decorated with exquisitely engraved baroque style foliate scrolls, has radial Roman numerals, outer track with Arabic five minutes numerals, and black arrow hands. And the full plate movement has chain/fusee and barrel for going train, three florally engraved barrels for striking- and alarm train with locking device, four hammers, three-arm steel balance. Dial and movement signed.
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Diameter: 105 mm
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Weight: 1050 g
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Signed: Johann Martin Horn, Augsprug
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Johann Martin Horn was a watchmaker in Augsburg who became a master in 1750. Records of his work date from 1750 to 1786
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Champlevé is an enamelling technique in the decorative arts, or an object made by that process, in which troughs or cells are carved, etched, die struck, or cast into the surface of a metal object and filled with vitreous enamel. The piece is then fired until the enamel fuses, and when cooled, the object’s surface is polished. The uncarved portions of the original surface remain visible as a frame for the enamel designs; typically, they are gilded in medieval work.[1] The name comes from the French for “raised field”, “field” meaning background, though the technique in practice lowers the area to be enamelled rather than raising the rest of the surface.