Good strong model. Evolved from the Mk V line which in turn evolved from the Mk III line. This line was a complete departure from the older Colt revolvers which were exemplified by the Python, Official Police and Detective Special. Different internal lockwork, but very strong. Colt always had excellent metallurgy as well. Congratulations. If you want to know more about your revolver I suggest the Colt Forum.
http://www.coltforum.com/index.php