Seiko Cal. 5688 - 728

The Seiko 5688-728 represents an important milestone in Seiko's 1971 lineup. With its 21mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-05ef1669aab9]

Also known as: Samurai, Bellmatic

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Burgundy

Jewels

32j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1971

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