Seiko Cal. 6637 - 389

The 6637-389 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6637 caliber with 32j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-ed8b79560cce]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

14.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

180m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1994

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