Seiko Cal. 4559 - 992

Seiko 4559-992

The Seiko 4559-992 represents an important milestone in Seiko's 1987 lineup. Powered by the 4559 caliber with 20j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-37644feb496a]

Also known as: Helmet, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
11.0mm
Lug Width
22mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
170m
Dial Color
White
Jewels
20j
Frequency
36,000 bph
Power Reserve
64 hours
Year
1987

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