Seiko Cal. 5638 - 837

The Seiko 5638-837 represents an important milestone in Seiko's 1982 lineup. With its 19mm lug width and 14.3mm profile, it sits comfortably on most wrists. [seikata-wm-cdaa59110c76]

Also known as: Sumo, Bullhead

Specifications

Movement

Solar

Case Material

Titanium

Case Width

40mm

Case Thickness

14.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Burgundy

Jewels

22j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1982

Related Models

• Seiko 7027-786
• Seiko 3843-878
• Seiko 6123-621
• Seiko 4512-979
• Seiko 6627-133
• Seiko 4456-693
• Seiko 6661-510
• Seiko 0776-340
• Seiko 6184-515
• Seiko 4562-550
• Seiko 4576-690
• Seiko 6252-834