Seiko Cal. 5631 - 577

The Seiko 5631-577 represents an important milestone in Seiko's 1965 lineup. It features a Navy dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-24bb625b8c83]

Also known as: Tuna, Bellmatic

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

45mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Navy

Jewels

19j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1965

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