Seiko Cal. 5638 - 940

The Seiko 5638-940 represents an important milestone in Seiko's 1990 lineup. Powered by the 5638 caliber with 17j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-4622a93aa1a7]

Also known as: Sportsmatic

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

Black

Jewels

17j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1990

Related Models

• Seiko 5654-332
• Seiko 0739-134
• Seiko 3866-179
• Seiko 4589-774
• Seiko 6357-934
• Seiko 4582-139
• Seiko 6622-860
• Seiko 6112-193
• Seiko 4528-823
• Seiko 4548-367
• Seiko 6233-191
• Seiko 6118-934