Can you flip open the back and show a photo of the movement and case back? Looks like a jewelers name in Chile.
Update... It is a Jeweler in Chili still in operation! The dial is 100% legit. https://www.sinn.cl/historia.htm I wonder if there is any relation to Helmut Sinn...
The movement has Omega "DNA", we need to know the actual diameter in millimetres to help identify it. Serial number may be on the main plate under the dial. It looks like a national production case so may not have any Omega identifiers. Hands could be replacements or could even be original. Regulator needle is broken and its position indicates that the movement is badly in need of a service.
It has a nice dial, but there's nothing terribly special about it. Im not sure if you are buying or selling, but if you are buying, the cost of a service will probably be equal to (or more than) the value of the watch as it sits.
Movement is definitely Omega. First production had the name and serial number on the other side, under the dial. Hands are wrong, movement is basic. Unless you have a specific interest in the retailer who put his name on the dial, there is, in my humble opinion, no collecting interest. As Jim and Foo2rama said the asked price is above market value and service cost will at least double it.
The regulator looks odd and is likely unoriginal. The index is cut off, but if the index would be centered correctly on the balance cock, the regulating pins would be way too close to the stud. Hands are also not original. Stay away unless you need it for parts.