That's a nice watch though I think you'll be lucky to identify it as there just doesn't seem to be that much out there about ATP watches. The one thing about yours that is a little unusual is the ridges/serrations on the caseback. Did you get this off Ebay recently as I seem to remember seeing one with a similar caseback there - I had a google for a similar caseback then with no success
Good luck with the search and congratulations on your acquisition.