Seiko Cal. 6639 - 231

Seiko 6639-231

The 6639-231 is a sought-after Solar piece from Seiko's golden era. Powered by the 6639 caliber with 34j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-1ce6766b4383]

Also known as: Sumo, Baby Tuna

Specifications

Movement
Solar
Case Material
Gold-Plated
Case Width
43mm
Case Thickness
15.7mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
190m
Dial Color
White
Jewels
34j
Frequency
21,600 bph
Power Reserve
53 hours
Year
1984

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seikata-wm-1ce6766b4383