Seiko Prospex 1965 Heritage Diver SPB451 SPB453 SPB455 40mm

How it wears

Wears true to its 40 mm case size

Seiko Prospex 1965 Heritage Diver SPB451 SPB453 SPB455 40mm measures 46.4 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 8,010 watches in this database and shorter than 44% of the 390 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 46.4 mm (1.83 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 13 mm thick it sits within the typical range, thicker than 64% of the watches with a listed thickness.