Seiko Cal. 3854 - 991

Seiko 3854-991

The Seiko 3854-991 represents an important milestone in Seiko's 1972 lineup. Powered by the 3854 caliber with 18j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-27f7ed9f6ce7]

Also known as: Sumo, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
45mm
Case Thickness
11.1mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
100m
Dial Color
Navy
Jewels
18j
Frequency
21,600 bph
Power Reserve
36 hours
Year
1972

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