Seiko Cal. 6311 - 231

This Hand-Winding model from 1966 features a 37mm Gold-Plated case. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-4795d7b96eef]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1966

Related Models

• Seiko 0784-959
• Seiko 6191-225
• Seiko 7177-932
• Seiko 3839-866
• Seiko 4416-129
• Seiko 5274-782
• Seiko 7079-955
• Seiko 5250-552
• Seiko 7091-742
• Seiko 6343-361
• Seiko 3896-448
• Seiko 3817-431