Seiko Cal. 3871 - 633

Seiko 3871-633

This Automatic model from 1981 features a 43mm Hardlex-Coated Steel case. Powered by the 3871 caliber with 18j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-1ad9cc0a27fd]

Also known as: Helmet, Navigator

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
10.4mm
Lug Width
20mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
150m
Dial Color
White
Jewels
18j
Frequency
21,600 bph
Power Reserve
61 hours
Year
1981

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