Seiko Cal. 5681 - 139

Released in 1969, the Cal. 5681 with design code 139 was part of Seiko's domestic market collection. With its 21mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-edbca004dc37]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1969

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