Seiko Cal. 4557 - 521

The 4557-521 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 4557 caliber with 20j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-f2970486358e]

Also known as: Helmet, Rally

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1986

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