Seiko Cal. 5638 - 498

The Seiko 5638-498 represents an important milestone in Seiko's 1987 lineup. With its 21mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-52591902cf1a]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1987

Related Models

• Seiko 0722-892
• Seiko 6634-387
• Seiko 3826-850
• Seiko 4493-561
• Seiko 3890-754
• Seiko 6382-771
• Seiko 5665-475
• Seiko 6293-386
• Seiko 6218-345
• Seiko 4519-917
• Seiko 4483-902
• Seiko 4451-750