Seiko Cal. 6639 - 221

The 6639-221 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-1032f8d0657f]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Cream

Jewels

27j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1998

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