Seiko Cal. 3878 - 721

The Seiko 3878-721 represents an important milestone in Seiko's 1998 lineup. With its 20mm lug width and 15.0mm profile, it sits comfortably on most wrists. [seikata-wm-94123c2ecab5]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

140m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1998

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