Seiko Cal. 3870 - 634

Seiko 3870-634

The 3870-634 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3870 caliber with 34j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-87cf487b3dfb]

Also known as: Sumo, Emperor

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
45mm
Case Thickness
9.8mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
Burgundy
Jewels
34j
Frequency
36,000 bph
Power Reserve
71 hours
Year
1969

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