Seiko Cal. 6637 - 540

Seiko 6637-540

This Hand-Winding model from 1992 features a 37mm Titanium case. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-db1d74971e52]

Also known as: Sumo, Pogue

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
37mm
Case Thickness
11.3mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
80m
Dial Color
White
Jewels
34j
Frequency
28,800 bph
Power Reserve
67 hours
Year
1992

Related Models

seikata-wm-db1d74971e52