Seiko Cal. 5640 - 938

The Seiko 5640-938 represents an important milestone in Seiko's 1970 lineup. With its 21mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-a742665493fd]

Also known as: Samurai

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

24j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1970

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