Seiko Cal. 6311 - 731

The Seiko 6311-731 represents an important milestone in Seiko's 1967 lineup. It features a Silver dial protected by a Hardlex crystal and offers 160m of water resistance. [seikata-wm-19ff06f8bfcb]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1967

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