Seiko Cal. 7188 - 639

Seiko 7188-639

The 7188-639 is a sought-after Quartz piece from Seiko's golden era. Powered by the 7188 caliber with 33j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-21c2bdec0e8b]

Also known as: Sumo, Golden Tuna

Specifications

Movement
Quartz
Case Material
PVD Black
Case Width
46mm
Case Thickness
8.4mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
110m
Dial Color
White
Jewels
33j
Frequency
28,800 bph
Power Reserve
62 hours
Year
1997

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