Seiko Cal. 5644 - 439

The Seiko 5644-439 represents an important milestone in Seiko's 1971 lineup. It features a Navy dial protected by a Acrylic crystal and offers 150m of water resistance. [seikata-wm-3fc447a8950d]

Also known as: Sumo, Emperor

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

19j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1971

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