Seiko Cal. 5631 - 993

The 5631-993 is a sought-after Hand-Winding piece from Seiko's golden era. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-a34c18e5108a]

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

43mm

Case Thickness

14.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1965

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