Seiko Cal. 5288 - 638

The Seiko 5288-638 represents an important milestone in Seiko's 1987 lineup. Powered by the 5288 caliber with 28j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-ff2acb41815d]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1987

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