Seiko Cal. 5631 - 677

The Seiko 5631-677 represents an important milestone in Seiko's 1996 lineup. It features a Black dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-b56f48f58a33]

Also known as: Tuna, Emperor

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

43mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1996

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