Seiko Cal. 5648 - 391

This Spring Drive model from 1968 features a 37mm PVD Black case. With its 21mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-b5056bf70d20]

Also known as: World Timer, Sea Horse

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

White

Jewels

33j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1968

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