Seiko Cal. 3871 - 820

Seiko 3871-820

This Automatic model from 1984 features a 45mm Two-Tone case. Powered by the 3871 caliber with 34j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-52ca2b861ede]

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
45mm
Case Thickness
10.9mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
100m
Dial Color
Black
Jewels
34j
Frequency
28,800 bph
Power Reserve
38 hours
Year
1984

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seikata-wm-52ca2b861ede