Seiko Cal. 3831 - 637

Seiko 3831-637

The 3831-637 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3831 caliber with 27j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-3385a9525506]

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
42mm
Case Thickness
9.5mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
150m
Dial Color
Burgundy
Jewels
27j
Frequency
28,800 bph
Power Reserve
49 hours
Year
1981

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seikata-wm-3385a9525506