Seiko Cal. 6633 - 644

This Spring Drive model from 1968 features a 39mm Two-Tone case. With its 22mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-050e0a4af0cd]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

8.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

18j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1968

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