Seiko Cal. 7138 - 231

The Seiko 7138-231 represents an important milestone in Seiko's 1976 lineup. Powered by the 7138 caliber with 22j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-7d43eed8fcb1]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

22j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1976

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