Piguet 21

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.

Info

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.

Ebauche

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

• Patek Philippe Cal. 175 and 177
• Blancpain 21

See also

• Audemars Piguet 2003, which took the record for thinnest movement at 1.64 mm

Manufacturer: F. Piguet Description: Hand-wound movement Functions: Hour/minute hands Data: 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: 1925-present