Seiko Cal. 6663 - 840

The Seiko 6663-840 represents an important milestone in Seiko's 1970 lineup. The Coin-Edge bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-643301bbc042]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

10.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1970

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