Prospex Marinemaster 39.5mm

How it wears

Wears true to its 39.5 mm case size

Seiko Prospex Marinemaster 39.5mm measures 47.2 mm lug-to-lug on a 39.5 mm case, a lug-to-lug ratio of 1.19 against a database median of 1.18. That span is longer than 54% of the 7,421 watches in this database and longer than 62% of the 390 Seiko watches listed.

A flat wrist width of 53 mm (2.09 in) or more keeps it in the balanced range, and from 63 mm (2.48 in) it starts to look compact. Below 47.2 mm (1.86 in) the lugs are likely to overhang the wrist. Flat wrist width is measured straight across the top of the wrist, not around it.