Seiko Cal. 4421 - 931

Released in 1968, the Cal. 4421 with design code 931 was part of Seiko's domestic market collection. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-877ff3fb90ac]

Also known as: UFO, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1968

Related Models

• Seiko 4478-551
• Seiko 0729-320
• Seiko 3844-751
• Seiko 5294-919
• Seiko 3830-343
• Seiko 6399-882
• Seiko 4452-727
• Seiko 5281-379
• Seiko 7079-855
• Seiko 7045-390
• Seiko 6196-158
• Seiko 7084-953