Seiko Cal. 5644 - 376

This Quartz model from 1967 features a 37mm Two-Tone case. It features a Navy dial protected by a Acrylic crystal and offers 100m of water resistance. [seikata-wm-5e892a7b7cf8]

Also known as: Tuna, UFO

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Navy

Jewels

30j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1967

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