Seiko Cal. 6311 - 303

This Spring Drive model from 1969 features a 40mm Hardlex-Coated Steel case. With its 20mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-fd5758fb425a]

Also known as: Turtle, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Burgundy

Jewels

22j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1969

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