Jaeger LeCoulrte Duoplan Kal 101 - smallest clock in the world 74 parts 1 gram weight

When it was introduced in the 1920s, the LeCoultre caliber Duoplan, developed by Henri Rodanet (1884-1956), technical director of the Etablissements Edmond Jaeger , was one of the smallest watch movements with serious accuracy.

This was made possible by the two-level construction (hence the name of the model), which offered space for a sufficiently large balance wheel on a minimal footprint.

The winding crown was recessed into the case on the back. Produced in many different versions, the Jaeger Duoplan ladies' watch became a highly successful classic.

In 1929, the watchmakers of the company, which was renamed " Jaeger-LeCoultre " a year later, developed a smaller version of the Duoplan movement, which they called Caliber 101.

The Duoplan Caliber 101, with a length of 14 mm, a width of 4.8 mm and a height of 3.4 mm, is still the smallest mechanical movement in the world and is still produced in small numbers today, as all parts have to be made individually by hand.

Its original 74 components weighed just one gram together.

The world's most exclusive jewelry watches were and still are equipped with the miniature caliber 101 and adorn the wrists of the most privileged women.

 In 1953 , Queen Elizabeth II wore a Jaeger-LeCoultre 101 at her coronation. Cartier also used this Duoplan movement for its exclusive models