Piguet 21

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Calibre 21 is an ultra-thin hand-wound watch movement from F. Piguet.

This was the thinnest watch movement made from 1925 through the 2000's.


Cal. 21 was designed to be the thinnest watch movement available, and it achieved this goal notably: It retained the record for 21 years. Even without the record, this 90 year old movement design continues to be produced.

A relatively simple movement, Cal. 21 is hand wound and has a power reserve of 42 hours. It is a 9 ligne (20.4 mm) diameter movement and just 1.75 mm thick. It has 18 jewels. The movement originally oscillated at 18,000 A/h but later versions were boosted to 21,600 A/h.


Because it was so thin and proven, F. Piguet had much success selling ebauche versions of their Cal. 21 to other manufacturers.

See also


F. Piguet


Hand-wound movement


Hour/minute hands


18,000 or 21,600 A/h
9 ligne (20.4 mm) wide, 1.73 or 1.75 mm high
17 or 18 jewels

Production period: