Seiko Cal. 6643 - 837

The 6643-837 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 15.4mm profile, it sits comfortably on most wrists. [seikata-wm-8d146ec9d7bc]

Also known as: Silverwave, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

15.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

160m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1983

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