Seiko Cal. 5637 - 442

The Seiko 5637-442 represents an important milestone in Seiko's 1987 lineup. With its 21mm lug width and 12.3mm profile, it sits comfortably on most wrists. [seikata-wm-6eda75dac4e1]

Also known as: Tuna, UFO

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Burgundy

Jewels

31j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1987

Related Models

• Seiko 4441-112
• Seiko 6110-166
• Seiko 3844-703
• Seiko 0786-468
• Seiko 6386-924
• Seiko 7023-159
• Seiko 6179-955
• Seiko 3886-474
• Seiko 5671-463
• Seiko 3867-178
• Seiko 7162-119
• Seiko 5669-166