Seiko Cal. 6639 - 901

Seiko 6639-901

The 6639-901 is a sought-after Solar piece from Seiko's golden era. Powered by the 6639 caliber with 21j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-7acb89312c6a]

Also known as: Sportsmatic

Specifications

Movement
Solar
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
15.1mm
Lug Width
22mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
30m
Dial Color
Champagne
Jewels
21j
Frequency
28,800 bph
Power Reserve
36 hours
Year
1990

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