Seiko Cal. 5634 - 231

This Quartz model from 1978 features a 39mm PVD Black case. With its 21mm lug width and 14.3mm profile, it sits comfortably on most wrists. [seikata-wm-dd1fa379b3da]

Also known as: Sportsmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

39mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Navy

Jewels

20j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1978

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