Seiko Cal. 6691 - 671

The Seiko 6691-671 represents an important milestone in Seiko's 1970 lineup. Powered by the 6691 caliber with 31j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-1b09cdbb76e1]

Also known as: Monster

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

35mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

31j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1970

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