Reference 1378420 belongs to Jaeger-LeCoultre's Master collection, presented here as a 2024 example in a 39mm round stainless steel case. At just 10mm thin, the case pairs a fixed bezel with a scratch-resistant sapphire crystal, while a push/pull crown keeps the profile clean. Water resistance stands at 30 meters.
The silver-tone dial is laid out with index hour markers and silver-tone hands, organizing three sub-dials dedicated to seconds, date, and power reserve — the latter being the complication that defines this particular reference. The JLC Calibre 938 automatic movement operates at 28,800 vph and offers a 43-hour power reserve, with the movement visible through the skeleton case back.
The watch is worn on a strap secured by a deployment clasp with push-button release. Offered with its original box and papers, this unisex timepiece carries the Swiss Made designation and is ready for immediate wear.
