Seiko Cal. 7139 - 487

Seiko 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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