In 1907, when most watchmakers were still grappling with the transition from pocket watches to wristwatches, Jaeger-LeCoultre was already pushing boundaries with the LeCoultre Calibre 145. At a mere 1.38mm thick, this movement wasn’t just thin; it was revolutionary. This laid the foundation of the Master Ultra Thin.

Here’s marking the hours with Jaeger-LeCoulte’s Master Ultra Thin Perpetual Calendar.

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