Seiko Cal. 5631 - 863

Released in 1965, the Cal. 5631 with design code 863 was part of Seiko's domestic market collection. It features a Navy dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-09023aa3d5eb]

Also known as: UFO, Crown

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

34j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1965

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