Seiko Cal. 6639 - 263

The Seiko 6639-263 represents an important milestone in Seiko's 1990 lineup. Powered by the 6639 caliber with 27j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-46b4631a23c0]

Also known as: Rally, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

13.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Green

Jewels

27j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1990

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