Seiko Cal. 5638 - 725

The 5638-725 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 14.4mm profile, it sits comfortably on most wrists. [seikata-wm-a6d0ebff5589]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1972

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