Seiko Cal. 6637 - 164

The 6637-164 is a sought-after Hand-Winding piece from Seiko's golden era. With its 18mm lug width and 12.5mm profile, it sits comfortably on most wrists. [seikata-wm-5cf72f308826]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1968

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