Seiko Cal. 6638 - 504

The Seiko 6638-504 represents an important milestone in Seiko's 1996 lineup. Powered by the 6638 caliber with 21j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-cab85167183d]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1996

Related Models

• Seiko 6638-994
• Seiko 4551-209
• Seiko 4458-306
• Seiko 6697-927
• Seiko 6658-737
• Seiko 7166-645
• Seiko 6196-457
• Seiko 4455-981
• Seiko 5673-459
• Seiko 5296-648
• Seiko 3869-696
• Seiko 6257-400