Seiko Cal. 6637 - 645

The 6637-645 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-86072bd274d8]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

80m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1999

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