Seiko Cal. 3878 - 550

The Seiko 3878-550 represents an important milestone in Seiko's 1991 lineup. It features a Black dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-f817a3f25b22]

Also known as: Navigator

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1991

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