Ballon Bleu de Cartier 40 Extra Flat Pink Gold / Grey

In Context

At 40 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. The 6.9 mm case is genuinely slim and goes under a shirt cuff without argument. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. Rated to 30 m, it is protected against rain and splashes and nothing beyond that.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. Its 36-hour reserve wants wearing most days; leave it off and it stops. At 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

W6920089 stands on its own in this catalogue — no other reference here shares its base number. It pairs a grey guilloche dial with a pink gold case. Introduced in 2007.

Cartier-branded version of Piaget 430P, an ultra-thin hand-wound mechanical movement. Type: Hand-wound mechanical Shape: Round Functions: Minutes, Hours Technical features: Balance stop Power reserve (in hours): Approx. 43 Frequency (vph): 21,600 Frequency (Hz): 3 Diameter (lines): 9.00 Diameter (mm): 20.5 Number of jewels: 18 Thickness (mm): 2.1 Number of components: 131

6 other watches in the library run the Cartier 430 MC.

Cartier

Tortue Extra Thin Pink Gold / Silver

WGTO0002 · 34.6 mm

Cartier

Tortue Extra Flat White Gold / Silver

WGTO0003 · 34.6 mm

Cartier

Santos Dumont 31.4 China

W2SA0027 · 31.4 mm

Cartier

Santos Dumont 34.6 Pink Gold

W2006951 · 34.6 mm