Need help to check this watch

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I found this watch in my granpa's office.

I do note know anything about It, If It is original or a replica, can you help me with this?

Thank you !

 
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It’s genuine but the dial has been poorly repainted in a style not contemporary to the watch.
 
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A jumbo size omega 2505 for south america market; repainted dial; wrong hands (too short); movement in poor condition (worn out).