In the early 1950s, Jaeger-LeCoultre unveiled the Memovox, a name derived from the Latin words "Memor" and "Vox," symbolizing "the voice of memory." This revolutionary watch featured the hand-wound Calibre 489, distinguished by its dual crowns, which independently managed the alarm and time functions.

By 1956, this model evolved with the introduction of the Calibre 815, marking the Memovox as the pioneer in self-winding alarm wristwatches. Unique to the cal. 815 Memovox, the alarm remained manually wound, separate from the movement's automatic winding mechanism.

The evolution of Memovox reached a pinnacle with the creation of the Calibre 825. This movement, an advancement of the cal. 815, included a date feature and showcased exceptional craftsmanship. The cal. 825 is renowned for its distinctive "bumper" winding system and the hammer-based alarm mechanism, which offers a tangible sensation on the wrist, adding character to the watch.

Apart from these technical innovations, a standout feature of this specific watch is its rare world time dial. Despite its seemingly outdated utility, the allure of a mechanical alarm wristwatch remains unparalleled, symbolizing a blend of historical significance and mechanical ingenuity.