Seiko Cal. 6636 - 887

This Spring Drive model from 1974 features a 36mm Titanium case. The Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-0123de9fdcb3]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1974

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