Seiko Cal. 4421 - 378

This Hand-Winding model from 1977 features a 40mm Titanium case. With its 22mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-ae507302429d]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1977

Related Models

• Seiko 6346-145
• Seiko 7071-546
• Seiko 7063-862
• Seiko 7187-646
• Seiko 6389-615
• Seiko 5698-379
• Seiko 5630-117
• Seiko 0799-695
• Seiko 5285-106
• Seiko 4464-732
• Seiko 4483-289
• Seiko 6191-642