Seiko Cal. 5640 - 770

Seiko 5640-770

This Automatic model from 1967 features a 40mm Two-Tone case. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-93b6c64c6a74]

Also known as: Sumo, Bullhead

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
40mm
Case Thickness
13.4mm
Lug Width
19mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
110m
Dial Color
White
Jewels
32j
Frequency
28,800 bph
Power Reserve
44 hours
Year
1967

Related Models

seikata-wm-93b6c64c6a74