Seiko Cal. 3878 - 889

The 3878-889 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-f6e1c93a472a]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1968

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