Seiko Cal. 3878 - 312

The Seiko 3878-312 represents an important milestone in Seiko's 1981 lineup. With its 18mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-3b57ee1cf8b6]

Also known as: Sportsmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1981

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