Seiko Cal. 3888 - 647

This Spring Drive model from 1973 features a 44mm Two-Tone case. With its 18mm lug width and 9.4mm profile, it sits comfortably on most wrists. [seikata-wm-3bec4f37389d]

Also known as: Helmet, World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

9.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1973

Related Models

• Seiko 4516-739
• Seiko 5259-525
• Seiko 7073-307
• Seiko 5254-642
• Seiko 5635-998
• Seiko 7127-867
• Seiko 7063-386
• Seiko 0776-247
• Seiko 4483-655
• Seiko 4571-906
• Seiko 6199-531
• Seiko 3878-294