Looks original to me. There are some early seamaster which does not have hippocambus logo in the back.

 

Can I get your opinion on my recently obtained vintage omega. Any information as to its authenticity. Thanks

 

You'd be better off starting a new thread, or posting it in
https://omegaforums.net/threads/is-this-watch-real-or-fake-thread-aka-fake-busters.43911/

 

Probably authentic but the dial has been re-painted and the case polished.

Classic prep and sell that some dealers do.

Do you have a movement And inside caseback shot. ( these give us the serial, model and what cal movement you have )

 

Genuine, but both the movement and case are in pretty horrible condition.

Hard PASS on this one, even if the dial had been original.

 

The watch is authentic but not desirable ... return it if possible.

Next time please ask questions before you purchase by starting a new thread in the vintage forum.