History of Watchmaking

LeCoultre revealed the world’s smallest movement, the 101 calibre. It comprised 74 parts, measured 14 x 4.85 x 3.4 mm and weighed less than one gram.
Invention of the perpetual motion Atmos, "the clock that lives on air" (in principle for 60 years), by Jean-Louis Reutter, an engineer at LeCoultre (which became Jaeger LeCoultre in 1937).
Eterna launched the first eight-day alarm wristwatch.

World history

1928. Alexander Fleming (1881-1955) discovered penicillin.
Hirohito became Emperor of Japan.
1929. The Wall Street Crash (Black Thursday, October 24th).
Benito Mussolini, head of the Italian government, and Cardinal Pietro Gasparri signed the Latran Treaty in Rome, smoothing relations between the papacy and the Italian State.

Art and Culture

1928. Kodak introduced its first 16mm film, paving the way for home movies.
The Surrealist André Breton organised in Paris the first exhibition of works by the Spanish painter Salvador Dali.
Publication of the first Adventures of Tintin.