Seiko Cal. 5644 - 318

The Seiko 5644-318 represents an important milestone in Seiko's 1987 lineup. The Coin-Edge bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-4a2d2852de26]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

44mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1987

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