Seiko Cal. 6639 - 681

The 6639-681 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-b58c03beb369]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

24j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1982

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