Seiko Cal. 6231 - 166

Released in 1965, the Cal. 6231 with design code 166 was part of Seiko's domestic market collection. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-af347ce85031]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Cream

Jewels

33j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1965

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