Seiko Cal. 3815 - 591

Seiko 3815-591

The 3815-591 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3815 caliber with 30j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-ed8461ab37d8]

Also known as: Monster, UFO

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
36mm
Case Thickness
14.9mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
110m
Dial Color
Burgundy
Jewels
30j
Frequency
28,800 bph
Power Reserve
46 hours
Year
1983

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