Technically interesting probably Swiss 18 Carat gold watch Circa 1820

Exceptionally large observation watch with Seconde Morte
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A technically interesting, exceptionally large observation watch with Seconde Morte, probably made in Switzerland, circa 1820. The numbered open faced case of this watch is crafted from 18 Carat gold and has an engine turned back with an empty cartouche at the bottom, the maker’s mark FLB and the original dust cover marked with Echappement à cylinder and Quarte Joyaux. The white enamel original dial has Arabic numerals for the center seconds and a subsidiary minutes and hours dial at 6 o’clock with black Breguet steel hands. The technically interesting open faced movement has two barrels, independent jumping seconds and a cylinder escapement.
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Diameter: 59 mm
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Weight: 125 g
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Signed: No name
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The watch comes with a gold carabiner with the key.
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Seconde Morte
The seconde morte, also known as dead-beat seconds, is a complication of a mechanical movement in which the second hand moves every second. This is in contrast to the usual ‘running’ of the second hand. This complication is rare and was seen in the years before the quartz revolution, the 1970’s and 1980’s, but died a silent death because of the same quartz revolution. The reason for this was that the second hand moves per second in almost the same way as quartz watches, which ultimately also use a frequency of 1Hz. With that, the ‘running’ second hand became the distinction between mechanical watches and quartz watches. Incidentally, that external similarity only applies to the second hand jumping per second, the underlying mechanism of the dead seconds complication is of course of a completely different order.