Seiko Cal. 6637 - 794

The 6637-794 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6637 caliber with 20j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-b253a548fcb2]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1997

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