Seiko Cal. 6631 - 734

The Seiko 6631-734 represents an important milestone in Seiko's 1971 lineup. It features a Cream dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-8c4267b99432]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

13.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1971

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