Seiko Cal. 6688 - 633

The Seiko 6688-633 represents an important milestone in Seiko's 1969 lineup. Powered by the 6688 caliber with 31j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-9dd5efc635d1]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Burgundy

Jewels

31j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1969

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