Seiko Cal. 6635 - 311

The Seiko 6635-311 represents an important milestone in Seiko's 1967 lineup. Powered by the 6635 caliber with 24j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-f8a49e8de7ed]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

24j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1967

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