Seiko Cal. 6378 - 666

The Seiko 6378-666 represents an important milestone in Seiko's 1973 lineup. Powered by the 6378 caliber with 30j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-1e25c5a14655]

Also known as: Monster, Navigator

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

8.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

30j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1973

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