Seiko Cal. 6688 - 778

The Seiko 6688-778 represents an important milestone in Seiko's 1970 lineup. Powered by the 6688 caliber with 36j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-0c1332028ec0]

Also known as: Crown, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

140m

Dial Color

Green

Jewels

36j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1970

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