Seiko Cal. 5613 - 638

The Seiko 5613-638 represents an important milestone in Seiko's 1977 lineup. With its 22mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-8ec5e91c3d44]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1977

Related Models

• Seiko 4449-277
• Seiko 6354-880
• Seiko 6284-705
• Seiko 4476-745
• Seiko 5252-964
• Seiko 6113-766
• Seiko 4440-296
• Seiko 7027-270
• Seiko 7186-376
• Seiko 4541-275
• Seiko 6686-279
• Seiko 0731-393