Seiko Cal. 6678 - 642

The Seiko 6678-642 represents an important milestone in Seiko's 1975 lineup. Powered by the 6678 caliber with 30j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-8daf996c094e]

Also known as: Helmet, Crown

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

30j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1975

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