Seiko Cal. 5638 - 727

Released in 1985, the Cal. 5638 with design code 727 was part of Seiko's domestic market collection. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-4bdc4fc98292]

Also known as: Sumo, Flighty

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1985

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