Jaeger-LeCoultre Master 1538420 Series by TW Factory is presented as a refined horological creation under the BA1 edition.
TW Factory watchmakers spent over two years on development, conducting countless tests and sacrificing over a hundred movements in the process. From weekday, moonphase, date, to month functions, each complication has been carefully reconstructed to reflect the essence of genuine watchmaking craftsmanship, while offering a subtly distinct interpretation of its timeless appeal.
The new Master Calendar 1538420 Series features a 42mm case designed for enhanced wrist comfort.
Functional Layout
9 o’clock: weekday sub-dial
3 o’clock: month sub-dial
6 o’clock: moonphase with 24-hour display sub-dial
Perimeter: time display ring
Construction & Materials
Both front and caseback are fitted with sapphire crystal glass. The strap is made from imported Italian calfskin leather, paired with a folding clasp crafted from the same material as the case for visual consistency and refined feel.
Movement
Powered by an imported 9100 multifunction automatic movement, engineered to closely replicate the performance and energy efficiency of the original configuration.
A timepiece designed to balance mechanical complexity with elegant aesthetics, offering a refined wearing experience at accessible value.




