Seiko Cal. 3878 - 686

Seiko 3878-686

The 3878-686 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3878 caliber with 20j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-69a2ed8beed4]

Also known as: UFO, Emperor

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
15.2mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
170m
Dial Color
White
Jewels
20j
Frequency
28,800 bph
Power Reserve
44 hours
Year
1988

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