Seiko Cal. 7139 - 487

The Seiko 7139-487 represents an important milestone in Seiko's 1989 lineup. Powered by the 7139 caliber with 33j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-9a8f80235b47]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

10.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1989

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