Seiko Cal. 6639 - 478

Seiko 6639-478

This Solar model from 1997 features a 40mm Hardlex-Coated Steel case. Powered by the 6639 caliber with 21j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-7df2b7d7f58d]

Also known as: Sumo, Helmet

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
40mm
Case Thickness
9.1mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
30m
Dial Color
White
Jewels
21j
Frequency
21,600 bph
Power Reserve
62 hours
Year
1997

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