Seiko Cal. 4538 - 633

Released in 1976, the Cal. 4538 with design code 633 was part of Seiko's domestic market collection. Powered by the 4538 caliber with 29j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-04919e826e21]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

29j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1976

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