Seiko Cal. 7138 - 857

The Seiko 7138-857 represents an important milestone in Seiko's 1981 lineup. With its 18mm lug width and 8.5mm profile, it sits comfortably on most wrists. [seikata-wm-27fb50adfe35]

Also known as: Monster, Flighty

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1981

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