Seiko Cal. 5644 - 989

This Spring Drive model from 1987 features a 36mm Hardlex-Coated Steel case. It features a Green dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-0a54d6da7bf3]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1987

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