Seiko Cal. 4427 - 391

This Hand-Winding model from 1969 features a 43mm Two-Tone case. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-9137fd818669]

Also known as: Helmet, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1969

Related Models

• Seiko 4422-739
• Seiko 3836-786
• Seiko 5270-153
• Seiko 5653-152
• Seiko 4451-914
• Seiko 4560-793
• Seiko 3829-865
• Seiko 6175-419
• Seiko 5690-217
• Seiko 0762-161
• Seiko 7115-911
• Seiko 4464-967