Manual-winding Spring Drive 40mm

How it wears

Wears smaller than its 40 mm case suggests

Grand Seiko Manual-winding Spring Drive 40mm measures 45.2 mm lug-to-lug on a 40 mm case, a lug-to-lug ratio of 1.13 against a database median of 1.18. That span is shorter than 69% of the 7,413 watches in this database and shorter than 68% of the 202 Grand Seiko watches listed.

A flat wrist width of 51 mm (2.01 in) or more keeps it in the balanced range, and from 61 mm (2.40 in) it starts to look compact. Below 45.2 mm (1.78 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 9.6 mm thick it is on the slim side, thinner than 88% of the watches with a listed thickness.