Seiko Cal. 5637 - 181

The Seiko 5637-181 represents an important milestone in Seiko's 1978 lineup. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-1f9de3fcca74]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Burgundy

Jewels

32j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1978

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