Seiko Cal. 4438 - 740

The Seiko 4438-740 represents an important milestone in Seiko's 1968 lineup. With its 21mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-9b157ee1760c]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1968

Related Models

• Seiko 7039-303
• Seiko 4433-524
• Seiko 6182-827
• Seiko 5634-330
• Seiko 5645-431
• Seiko 7022-928
• Seiko 4418-932
• Seiko 4526-373
• Seiko 4420-352
• Seiko 3811-906
• Seiko 5220-672
• Seiko 7017-971