Seiko Cal. 4425 - 520

This Hand-Winding model from 1981 features a 45mm Hardlex-Coated Steel case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-7e2bcb340c09]

Also known as: Monster, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1981

Related Models

• Seiko 7071-527
• Seiko 6214-674
• Seiko 6236-837
• Seiko 4533-133
• Seiko 5684-252
• Seiko 6676-500
• Seiko 0781-960
• Seiko 5632-387
• Seiko 6295-194
• Seiko 4471-938
• Seiko 6344-674
• Seiko 6213-863