Help identify 1960s? Omega watch.

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Omega with no model designation. Has subdial and no number 6. Was awarded to my late grandfather in Australia for 20yrs service with ICI.

 
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Have it opened by watchmaker all info is inside- movement serial number and caliber, and inside caseback for reference info. Looks like quite a lot of dial damage, consider having it serviced if you wish to keep as heirloom. Otherwise sell as is.