Seiko Cal. 5631 - 628

Released in 1970, the Cal. 5631 with design code 628 was part of Seiko's domestic market collection. The Fixed bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-3ef26ce510f9]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

8.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1970

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