Seiko Cal. 3873 - 721

The Seiko 3873-721 represents an important milestone in Seiko's 1976 lineup. With its 22mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-0ae4760893fd]

Also known as: Bellmatic, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Black

Jewels

24j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1976

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