Seiko Cal. 6637 - 867

The 6637-867 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6637 caliber with 28j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-fad3e5b38b8b]

Also known as: Sumo, Emperor

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

45mm

Case Thickness

14.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Burgundy

Jewels

28j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1977

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