Did you know?
At the 1851 Great Exhibition in London, Patek Philippe showed a watch measuring 9-mm in diameter. It held the record as the smallest cylinder escapement watch for almost half a century, until the chronometer-maker Paul Ditisheim claimed the title for the half-boule watch he presented at the Paris World’s Fair in 1900. Fitted with a movement measuring 6.75-mm and a cylinder escapement positioned above the mainplate, it weighed just 0.95 grams.