Seiko Cal. 5644 - 697

The Seiko 5644-697 represents an important milestone in Seiko's 1979 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-dae6bfe0eace]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

13.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1979

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