Seiko Cal. 6640 - 316

Seiko 6640-316

This Quartz model from 1982 features a 43mm Two-Tone case. The Fixed bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-f712581fcfdb]

Also known as: Sumo, Helmet

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
43mm
Case Thickness
9.6mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
50m
Dial Color
Champagne
Jewels
33j
Frequency
21,600 bph
Power Reserve
59 hours
Year
1982

Related Models

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