Seiko Cal. 6643 - 407

Seiko 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

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