Seiko Cal. 7138 - 422

The Seiko 7138-422 represents an important milestone in Seiko's 1971 lineup. With its 18mm lug width and 13.9mm profile, it sits comfortably on most wrists. [seikata-wm-e8daa1c6bc8f]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Burgundy

Jewels

33j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1971

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