Seiko Cal. 5633 - 378

The Seiko 5633-378 represents an important milestone in Seiko's 1980 lineup. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-6d1962fe5fbb]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1980

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