Seiko Cal. 6138 - 628

The Seiko 6138-628 represents an important milestone in Seiko's 1966 lineup. Powered by the 6138 caliber with 35j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-66fc918b24f4]

Also known as: Bullhead, Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

11.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1966

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