Seiko Cal. 5634 - 378

The Seiko 5634-378 represents an important milestone in Seiko's 1983 lineup. With its 18mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-8e520f69865c]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

41mm

Case Thickness

15.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1983

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