Seiko Cal. 4491 - 637

The 4491-637 is a sought-after Hand-Winding piece from Seiko's golden era. With its 18mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-87bfcf416ec7]

Also known as: UFO, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Burgundy

Jewels

22j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1991

Related Models

• Seiko 6383-750
• Seiko 6315-629
• Seiko 6173-664
• Seiko 0715-508
• Seiko 6378-493
• Seiko 4436-939
• Seiko 0718-507
• Seiko 7119-152
• Seiko 4559-695
• Seiko 6283-603
• Seiko 6276-203
• Seiko 5222-802