Chronomat B31 Automatic 40

How it wears

Wears smaller than its 40 mm case suggests

Breitling Chronomat B31 Automatic 40 measures 43.7 mm lug-to-lug on a 40 mm case, a lug-to-lug ratio of 1.09 against a database median of 1.18. That span is shorter than 81% of the 7,413 watches in this database and shorter than 88% of the 298 Breitling watches listed.

A flat wrist width of 49 mm (1.93 in) or more keeps it in the balanced range, and from 59 mm (2.32 in) it starts to look compact. Below 43.7 mm (1.72 in) the lugs are likely to overhang the wrist. Flat wrist width is measured straight across the top of the wrist, not around it.

At 10.99 mm thick it sits within the typical range, thicker than 26% of the watches with a listed thickness.