Seiko Cal. 6638 - 339

The Seiko 6638-339 represents an important milestone in Seiko's 1975 lineup. Powered by the 6638 caliber with 35j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-9a429195bfa4]

Also known as: Rally

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

41mm

Case Thickness

15.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Navy

Jewels

35j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1975

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