Seiko Cal. 6631 - 111

The Seiko 6631-111 represents an important milestone in Seiko's 1969 lineup. The Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-b898d411eca9]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1969

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