Seiko Cal. 5644 - 807

The Seiko 5644-807 represents an important milestone in Seiko's 1968 lineup. With its 20mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-6fa7fdf59cba]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

43mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1968

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