Heritage Manual-winding Spring Drive 40mm

How it wears

Wears true to its 40 mm case size

Grand Seiko Heritage Manual-winding Spring Drive 40mm measures 46.2 mm lug-to-lug on a 40 mm case, a lug-to-lug ratio of 1.16 against a database median of 1.18. That span is shorter than 58% of the 7,413 watches in this database and shorter than 54% of the 202 Grand Seiko watches listed.

A flat wrist width of 52 mm (2.05 in) or more keeps it in the balanced range, and from 62 mm (2.44 in) it starts to look compact. Below 46.2 mm (1.82 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 10.5 mm thick it is on the slim side, thinner than 80% of the watches with a listed thickness.