Seiko Cal. 5631 - 510

Released in 1976, the Cal. 5631 with design code 510 was part of Seiko's domestic market collection. With its 19mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-194fc0fc341f]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

9.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1976

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