Seiko Cal. 4537 - 690

The Seiko 4537-690 represents an important milestone in Seiko's 1991 lineup. Powered by the 4537 caliber with 27j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-9b2233e828c7]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Champagne

Jewels

27j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1991

Related Models

• Seiko 7162-900
• Seiko 5288-890
• Seiko 5620-430
• Seiko 5285-842
• Seiko 5666-550
• Seiko 4562-567
• Seiko 7045-479
• Seiko 4480-497
• Seiko 6299-411
• Seiko 6692-877
• Seiko 6288-705
• Seiko 6649-323