Seiko Cal. 5681 - 590

Released in 1975, the Cal. 5681 with design code 590 was part of Seiko's domestic market collection. With its 20mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-9fe781cb661b]

Also known as: Monster, Baby Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

12.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1975

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