Seiko Cal. 6631 - 531

The 6631-531 is a sought-after Spring Drive piece from Seiko's golden era. The Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-c82a97d9aa28]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

13.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Burgundy

Jewels

32j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1980

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