Seiko Cal. 4447 - 428

The 4447-428 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-dd87cbdd1624]

Also known as: Helmet, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

8.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

31j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1990

Related Models

• Seiko 0792-376
• Seiko 5268-937
• Seiko 7155-684
• Seiko 7194-350
• Seiko 4460-435
• Seiko 6381-995
• Seiko 5221-287
• Seiko 0726-978
• Seiko 6113-596
• Seiko 7135-947
• Seiko 5280-661
• Seiko 7034-927