Seiko Cal. 4431 - 537

The Seiko 4431-537 represents an important milestone in Seiko's 1984 lineup. Powered by the 4431 caliber with 29j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-a57e045f1fbf]

Also known as: Sumo, World Timer

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

41mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

White

Jewels

29j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1984

Related Models

• Seiko 7140-945
• Seiko 6384-237
• Seiko 6128-599
• Seiko 3864-978
• Seiko 3864-561
• Seiko 5243-396
• Seiko 5662-499
• Seiko 6186-375
• Seiko 3853-213
• Seiko 4596-487
• Seiko 0794-435
• Seiko 0772-638