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The Congreve rolling ball clock dates back to 1808. This excellent example of craftsmanship is by R. M. Pack, member of the National Association of Watch and Clock Collectors (Photo courtesy NAWCC)

The Congreve rolling ball clock dates back to 1808. This excellent example of craftsmanship is by R. M. Pack, member of the National Association of Watch and Clock Collectors (Photo courtesy NAWCC)

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