Seiko Cal. 5644 - 181

This Spring Drive model from 1965 features a 44mm Titanium case. With its 18mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-02c8e8b316a6]

Also known as: Bullhead, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

12.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

Navy

Jewels

22j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1965

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