Seiko Cal. 6688 - 641

The Seiko 6688-641 represents an important milestone in Seiko's 1967 lineup. It features a Silver dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-733d25976c6d]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Silver

Jewels

33j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1967

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