Seiko Cal. 6378 - 663

The Seiko 6378-663 represents an important milestone in Seiko's 1969 lineup. The Fixed bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-eb87d5e1fcf6]

Also known as: UFO, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1969

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