Seiko Cal. 6691 - 817

The Seiko 6691-817 represents an important milestone in Seiko's 1973 lineup. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-15267c191964]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1973

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