Seiko Cal. 4481 - 310

This Spring Drive model from 1975 features a 41mm Titanium case. It features a Navy dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-9fcf5e9b0b43]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

9.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

29j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1975

Related Models

• Seiko 6671-186
• Seiko 0744-519
• Seiko 5616-737
• Seiko 5210-149
• Seiko 5658-611
• Seiko 6648-634
• Seiko 6113-690
• Seiko 5642-888
• Seiko 3835-616
• Seiko 5281-244
• Seiko 6156-114
• Seiko 7143-828