Seiko Cal. 4431 - 634

This Spring Drive model from 1982 features a 43mm Gold-Plated case. Powered by the 4431 caliber with 20j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-627e227c3442]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1982

Related Models

• Seiko 5235-423
• Seiko 6273-839
• Seiko 4434-199
• Seiko 4425-776
• Seiko 5691-245
• Seiko 6683-386
• Seiko 7030-796
• Seiko 3877-476
• Seiko 4422-378
• Seiko 6228-766
• Seiko 6384-197
• Seiko 4497-828