Seiko Cal. 3878 - 390

The Seiko 3878-390 represents an important milestone in Seiko's 1968 lineup. With its 20mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-d7baaecdd2eb]

Also known as: Silverwave

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Silver

Jewels

24j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1968

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