Seiko Cal. 5661 - 636

The Seiko 5661-636 represents an important milestone in Seiko's 1991 lineup. With its 19mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-2f3fe28f24ef]

Also known as: UFO

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

11.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

40m

Dial Color

Cream

Jewels

28j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1991

Related Models

• Seiko 4434-726
• Seiko 4527-706
• Seiko 6165-366
• Seiko 6146-438
• Seiko 4538-470
• Seiko 5220-735
• Seiko 7036-930
• Seiko 7127-498
• Seiko 6220-359
• Seiko 5279-310
• Seiko 6268-474
• Seiko 5657-329