Seiko Cal. 4550 - 637

The Seiko 4550-637 represents an important milestone in Seiko's 1994 lineup. Powered by the 4550 caliber with 27j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-3dc079bd09ce]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Champagne

Jewels

27j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1994

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