Seiko Cal. 6638 - 985

The Seiko 6638-985 represents an important milestone in Seiko's 1999 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-6f5a2568b8d7]

Also known as: Helmet, Sea Horse

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

40mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Champagne

Jewels

21j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1999

Related Models

• Seiko 5227-263
• Seiko 6694-714
• Seiko 0767-943
• Seiko 3854-421
• Seiko 4595-386
• Seiko 6646-535
• Seiko 7053-860
• Seiko 3850-631
• Seiko 0781-108
• Seiko 7149-822
• Seiko 3894-874
• Seiko 5651-102