Seiko Cal. 4420 - 581

The 4420-581 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-001f31937b16]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1988

Related Models

• Seiko 7062-801
• Seiko 6279-802
• Seiko 4584-342
• Seiko 4559-587
• Seiko 6623-736
• Seiko 0712-845
• Seiko 5287-209
• Seiko 6378-809
• Seiko 6217-527
• Seiko 7092-537
• Seiko 6348-610
• Seiko 5241-990