Seiko Cal. 6643 - 140

The 6643-140 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Acrylic crystal and offers 160m of water resistance. [seikata-wm-8ccf52240cec]

Also known as: Helmet, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

9.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1979

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