Seiko Cal. 7031 - 881

This Spring Drive model from 1981 features a 36mm Two-Tone case. Powered by the 7031 caliber with 20j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-99be2cabcb98]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1981

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