February 9, 2023

The Jaeger-LeCoultre Master Ultra-Thin 1907 is the second ultra-thin timepiece from this watchmaking grande maison in Switzerland.

The Master Ultra Thin 1907 comes in a 39-mm rose-gold case that is just 4.05-mm thick.
This watch’s design did not come out of thin air . It was inspired by a vintage pocketwatch, and not just any old pocketwatch but the world’s thinnest pocketwatch .
Inside the watch ticks the world’s thinnest manually wound movement, Jaeger-LeCoultre Caliber 849. It comprises 123 parts and is just 1.85-mm in height.The movement is even thinner, and when fully wound it has a power reserve of 35 hours.Jaeger-LeCoultre_Master_Ultra_Thin_1907_Q1292520_profile Jaeger-LeCoultre-Master-UltraThin1907-12 resizedimage600338-Jaeger-LeCoultre-2
The caseback is solid because adding a sapphire window to it would immediately increase the case thickness. The part around the case is thinner and used to screw the lugs onto. The case is strapped to the wrist with a glossy brown alligator strap, without any visible stitching, and a rose-gold tang buckle.
The dial is white, with a finely grained surface, and features printed minute dots, and stick hour markers, with double stick markers at 12, 3, 6 and 9 o’clock.
The hands are so-called dauphine hands and, as is typical for JLC, one side of each hand is sandblasted while the other half is polished.
In conclusion, this watch is a perfect, classical dress watch. Even with less formal attire, it looks very good. This Jaeger-LeCoultre is probably the thinnest of this style of dress watch on the market.