Seiko Cal. 6631 - 522

The 6631-522 is a sought-after Hand-Winding piece from Seiko's golden era. With its 18mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-5aa3cc32f406]

Also known as: Bellmatic, World Timer

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

34j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1976

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