Seiko Cal. 6643 - 395

The Seiko 6643-395 represents an important milestone in Seiko's 1971 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-b0d0e4e80b12]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1971

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