Seiko Cal. 5640 - 771

Seiko 5640-771

This Automatic model from 1966 features a 38mm Hardlex-Coated Steel case. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-af615f644ae1]

Also known as: Bullhead, Crown

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
8.7mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
130m
Dial Color
Navy
Jewels
25j
Frequency
21,600 bph
Power Reserve
50 hours
Year
1966

Related Models

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