Seiko Cal. 5643 - 664

The Seiko 5643-664 represents an important milestone in Seiko's 1965 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-aaab182ad648]

Also known as: Turtle, Silverwave

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1965

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