Seiko Cal. 6311 - 931

The Seiko 6311-931 represents an important milestone in Seiko's 1972 lineup. With its 20mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-d8cb95de1db8]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Silver

Jewels

35j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1972

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