Seiko Cal. 3870 - 866

Seiko 3870-866

The 3870-866 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3870 caliber with 20j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-f0ccc253a628]

Also known as: Turtle, UFO

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
42mm
Case Thickness
14.7mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
160m
Dial Color
Blue Sunburst
Jewels
20j
Frequency
28,800 bph
Power Reserve
58 hours
Year
1971

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