Seiko Cal. 6637 - 251

This Hand-Winding model from 1966 features a 36mm PVD Black case. The Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-8df742b62e09]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Green

Jewels

26j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1966

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