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I’ll try not to force anything. If someone did just hammer it then it may be very difficult to pry off. Might have to replace the entire midcase depending on the damage.
Are you sure it is gold ? It looks plated to me. Case back is steel !
Mid case should be threaded. If a non threaded case back was hammered on, the mid case will be shagged. Even if it was not hammered on, mid case thread would have to be cleaned up on a lathe. It is pretty much a lose lose situation you are in. Why not return it and get your money back as I can only see it as a parts watch without an original case back which is going to be very difficult to source.