Seiko Cal. 7131 - 511

The Seiko 7131-511 represents an important milestone in Seiko's 1969 lineup. With its 21mm lug width and 15.0mm profile, it sits comfortably on most wrists. [seikata-wm-c080959e806d]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1969

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