Seiko Cal. 5631 - 328

The 5631-328 is a sought-after Automatic piece from Seiko's golden era. With its 18mm lug width and 14.0mm profile, it sits comfortably on most wrists. [seikata-wm-d391597b296d]

Also known as: UFO

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1999

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