Seiko Cal. 5637 - 831

The Seiko 5637-831 represents an important milestone in Seiko's 1981 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-f0a4a1389f5a]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1981

Related Models

• Seiko 7043-718
• Seiko 5228-943
• Seiko 6336-470
• Seiko 5276-711
• Seiko 4555-229
• Seiko 6310-650
• Seiko 7054-828
• Seiko 4498-977
• Seiko 6252-922
• Seiko 3855-540
• Seiko 5236-821
• Seiko 3816-886