Seiko Cal. 5688 - 351

The Seiko 5688-351 represents an important milestone in Seiko's 1970 lineup. With its 22mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-27801e2353df]

Also known as: Tuna, Bullhead

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Green

Jewels

24j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1970

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