Seiko Cal. 5638 - 735

The 5638-735 is a sought-after Spring Drive piece from Seiko's golden era. With its 19mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-93beacfe8d07]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

14.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Burgundy

Jewels

20j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1974

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