Imperial Chinese bronze usually had between four and six marks. Replicas that featured Chinese Imperial marks were produced for people's enjoyment, and not always meant to fool anyone. The copy could have been a sign of respect. Replicas are often produced for decorative purposes.
The Smithsonian Libraries has an online book called "Illustrated Catalog of Antique Chinese Bronzes, Porcelains, Tomb, Jade, and Rare Old Chinese Paintings." You might want to start your investigation there.