Seiko Cal. 6639 - 897

The 6639-897 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-d561d467918a]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

13.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1984

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