Seiko Cal. 6638 - 732

The Seiko 6638-732 represents an important milestone in Seiko's 1975 lineup. The Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-ff492ff01865]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Green

Jewels

35j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1975

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