Seiko Cal. 6643 - 578

The 6643-578 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6643 caliber with 32j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-ba446cd60b62]

Also known as: Bellmatic, Flighty

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1997

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