Seiko Cal. 6637 - 556

This Quartz model from 1986 features a 40mm Titanium case. It features a Champagne dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-e1a05c1798b0]

Also known as: Monster, Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

40mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Champagne

Jewels

27j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1986

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