Seiko Cal. 5631 - 251

The Seiko 5631-251 represents an important milestone in Seiko's 1997 lineup. Powered by the 5631 caliber with 27j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-993eb02a60a4]

Also known as: UFO

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

9.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1997

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