Seiko Cal. 3888 - 637

The Seiko 3888-637 represents an important milestone in Seiko's 1976 lineup. With its 20mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-ad0dd06ed3f8]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

9.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

31j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1976

Related Models

• Seiko 3884-316
• Seiko 6292-107
• Seiko 6335-967
• Seiko 6645-645
• Seiko 0757-336
• Seiko 7089-191
• Seiko 0733-670
• Seiko 5655-250
• Seiko 7130-992
• Seiko 0738-498
• Seiko 6343-419
• Seiko 0779-421