Without any real facts behind me...what I would say is that if it’s a 2 stroke, it might be unlikely to be a 2003. Where I live Merc and mariner repacked the 9.9 way before then with a 10hp...right up until the 4 stroke took over, as far as I know.
If it’s a 4 stroke, it would be in the early days of them and could be a 9.9 I suppose.