Seiko Cal. 7138 - 556

The Seiko 7138-556 represents an important milestone in Seiko's 1967 lineup. The Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-3bccc237f752]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

190m

Dial Color

Cream

Jewels

30j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1967

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