Seiko Cal. 6638 - 997

The Seiko 6638-997 represents an important milestone in Seiko's 1970 lineup. The Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-4a7e4d92f360]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

18j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1970

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