Seiko Cal. 6637 - 645

The 6637-645 is a sought-after Automatic piece from Seiko's golden era. With its 21mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-efd93f9eb69a]

Also known as: UFO, Golden Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Cream

Jewels

36j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1966

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