Seiko Cal. 4428 - 100

This Spring Drive model from 1972 features a 38mm Gold-Plated case. With its 18mm lug width and 15.2mm profile, it sits comfortably on most wrists. [seikata-wm-1e0ec3e0aa03]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1972

Related Models

• Seiko 3863-787
• Seiko 7015-695
• Seiko 5611-247
• Seiko 6344-836
• Seiko 5267-949
• Seiko 4481-976
• Seiko 5668-184
• Seiko 7187-362
• Seiko 0738-141
• Seiko 7082-632
• Seiko 6296-931
• Seiko 6661-839