Seiko Cal. 4557 - 307

The Seiko 4557-307 represents an important milestone in Seiko's 1990 lineup. Powered by the 4557 caliber with 20j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-05e5dfbf2151]

Also known as: Sumo, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

13.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1990

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