Seiko Cal. 5644 - 331

The Seiko 5644-331 represents an important milestone in Seiko's 1988 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-f120f68b0ecf]

Also known as: Bellmatic, Navigator

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

8.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1988

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