Seiko Cal. 7138 - 313

The Seiko 7138-313 represents an important milestone in Seiko's 1987 lineup. With its 20mm lug width and 15.2mm profile, it sits comfortably on most wrists. [seikata-wm-f9937f1ae8f8]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Cream

Jewels

35j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1987

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