Seiko Cal. 5647 - 736

This Spring Drive model from 1971 features a 37mm Two-Tone case. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-c8379de5571d]

Also known as: Bullhead, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

160m

Dial Color

Burgundy

Jewels

18j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1971

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