Seiko Cal. 6634 - 631

The Seiko 6634-631 represents an important milestone in Seiko's 1973 lineup. With its 19mm lug width and 9.4mm profile, it sits comfortably on most wrists. [seikata-wm-6b61af6fd2a9]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

35mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Champagne

Jewels

30j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1973

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