Omega “replica” – real or not?

Hi everyone. Apologies if this didn’t require a new thread. Looking to buy this watch and wondering if it’s a real or fake. Done a bit of research however not sure if there are any particular hall marks I should be looking for?
Will go to take better photos later but any help is appreciated. Wondering if it is a Seamaster ST 366.0875? Sorry for the bad photos!

Thanks in advance