Seiko Cal. 6635 - 203

The Seiko 6635-203 represents an important milestone in Seiko's 1966 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-5b892dae5eb2]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Navy

Jewels

19j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1966

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