Seiko Cal. 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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