Seiko Cal. 4421 - 812

The Seiko 4421-812 represents an important milestone in Seiko's 1976 lineup. Powered by the 4421 caliber with 24j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-f839312bfc1d]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

35mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1976

Related Models

• Seiko 6651-644
• Seiko 6126-517
• Seiko 7041-242
• Seiko 7175-800
• Seiko 3866-750
• Seiko 6280-732
• Seiko 3861-236
• Seiko 0720-783
• Seiko 7019-657
• Seiko 7091-883
• Seiko 4413-677
• Seiko 6310-695