Seiko Cal. 5638 - 944

The Seiko 5638-944 represents an important milestone in Seiko's 1981 lineup. Powered by the 5638 caliber with 31j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-f6e573c34d6a]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1981

Related Models

• Seiko 6343-966
• Seiko 0726-893
• Seiko 6261-430
• Seiko 6184-213
• Seiko 6139-596
• Seiko 4432-366
• Seiko 7083-293
• Seiko 4593-424
• Seiko 6620-867
• Seiko 7197-339
• Seiko 4588-537
• Seiko 6367-750