Seiko Cal. 6631 - 253

The Seiko 6631-253 represents an important milestone in Seiko's 1971 lineup. The Fixed bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-c679de0fc067]

Also known as: Tuna, Crown

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

34mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1971

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