Seiko Cal. 6637 - 131

This Quartz model from 1978 features a 36mm Titanium case. It features a Burgundy dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-60cfa658ef58]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

11.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1978

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