Seiko Cal. 5638 - 791

The Seiko 5638-791 represents an important milestone in Seiko's 1971 lineup. It features a Navy dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-7213c8ef2213]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

33j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1971

Related Models

• Seiko 4482-751
• Seiko 6297-558
• Seiko 3856-798
• Seiko 4580-758
• Seiko 4467-538
• Seiko 6130-603
• Seiko 5246-438
• Seiko 0744-142
• Seiko 7069-454
• Seiko 7049-883
• Seiko 3882-538
• Seiko 6374-348