(1929) JAEGER-LECOULTRE CALIBRE 101
In 1929 this was the world’s smallest mechanical movement, and it remains so today, as attested to by the Guinness Book of World Records. Women were setting the wristwatch trend, and it was important for a manufacturer to create wristwatches with purpose- built cases and movements, with comfort and lightness being key. This movement is 14mm in length, 4.8mm in width, and 3.4mm in height and comprises 74 individual components and weighs only 0.9 grams; its tiniest component weighs a mere 0.17 milligrams. It remains largely unchanged today and is still used in some special edition timepieces. It became world-famo u s when Queen Elizabeth II wore it at her coronation in 1953.