Seiko Cal. 6643 - 407

The 6643-407 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6643 caliber with 30j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-a25c55b9ef30]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

11.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1990

Related Models

• Seiko 6333-819
• Seiko 7187-851
• Seiko 5278-869
• Seiko 6395-313
• Seiko 6121-386
• Seiko 5673-523
• Seiko 6359-327
• Seiko 4589-663
• Seiko 4429-899
• Seiko 6677-737
• Seiko 4528-779
• Seiko 4468-984