Seiko Cal. 4438 - 643

The Seiko 4438-643 represents an important milestone in Seiko's 1977 lineup. It features a Burgundy dial protected by a Hardlex crystal and offers 120m of water resistance. [seikata-wm-a40c09e918e3]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Burgundy

Jewels

31j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1977

Related Models

• Seiko 7076-139
• Seiko 6183-916
• Seiko 7070-797
• Seiko 4483-277
• Seiko 4553-484
• Seiko 3877-109
• Seiko 6240-675
• Seiko 6275-649
• Seiko 6618-331
• Seiko 7083-842
• Seiko 4581-697
• Seiko 7036-615