Seiko Cal. 4556 - 181

The 4556-181 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-b9512dcad9ae]

Also known as: Sumo, Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Black

Jewels

36j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1999

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