Seiko Cal. 6688 - 431

The Seiko 6688-431 represents an important milestone in Seiko's 1965 lineup. Powered by the 6688 caliber with 24j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-03b874d27a0c]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

11.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

White

Jewels

24j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1965

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