Seiko Cal. 0731 - 648

Seiko 0731-648

This Spring Drive model from 1974 features a 37mm Titanium case. With its 21mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-368d9f7b85a1]

Also known as: Silverwave, Golden Tuna

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
37mm
Case Thickness
14.7mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
100m
Dial Color
Green
Jewels
35j
Frequency
36,000 bph
Power Reserve
68 hours
Year
1974

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