Seiko Cal. 5631 - 303

Released in 1968, the Cal. 5631 with design code 303 was part of Seiko's domestic market collection. It features a Green dial protected by a Mineral crystal and offers 60m of water resistance. [seikata-wm-2f44565185bb]

Also known as: Bullhead, Goldfeather

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

34mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Green

Jewels

33j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1968

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