Help Omega vintage 2627-5sc

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Hello friends, can you identify if this watch is real or fake? I suspect that the dial may have been changed, it contains the numbers 2, 4, 8, 10 and 12 and in the searches I did, in some dials we have the numbers 3, 9 and 12. In this also it has not written Swiss made below the date. Researching further, I found that at the time some may have come this way.

 
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Looks real but dial has been repainted. The calendar font gives it away immediately
 
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I agree with @amuscare87 that it’s been repainted but whoever did it made a nice job of it
 
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Thank you my friend, can you tell me the approximate value of this watch?

Look at the sold/completed listings on eBay