I need help in identifying this omega watch

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C case Constellation ref 168.017.The serial suggests it's c.1965/66 however, that seems early for a C-case.

The dial has been refinished so it makes me wonder whether it had significant water damage resulting in both the dial being repainted and the movement swapped.
 
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It's an Omega "C" cased Constellation, case reference 168.017 with an awfully bad re-dial.
1966 would be roughly correct for the date.
 
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Looks like Harold did the redial, but couldn’t find his purple crayon.