Seiko Cal. 5681 - 613

The Seiko 5681-613 represents an important milestone in Seiko's 1993 lineup. With its 21mm lug width and 13.9mm profile, it sits comfortably on most wrists. [seikata-wm-789c0d97eb9d]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Burgundy

Jewels

33j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1993

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