Seiko Cal. 5637 - 976

The Seiko 5637-976 represents an important milestone in Seiko's 1971 lineup. With its 18mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-1b0a4cd97a3f]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1971

Related Models

• Seiko 6221-268
• Seiko 5245-407
• Seiko 4572-356
• Seiko 7198-886
• Seiko 6166-498
• Seiko 4469-745
• Seiko 6135-906
• Seiko 4415-104
• Seiko 7072-738
• Seiko 3893-138
• Seiko 4516-374
• Seiko 7038-616