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.
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