One of Daniel Roth’s signature models is its 8-Day tourbillon, which is designed and manufactured in-house.     Daniel Roth’s simplest perpetual calendar model, if it can be called that, is the perpetual calendar with moon phase, shown below; the other Daniel Roth perpetual calendars have added complications like equation of time, stopwatch or tourbillon.     This year Daniel Roth has combined both the 8-Day tourbillon and the perpetual calendar to create a un...

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