That's a pretty early receiver. I have a orphan receiver in the 43,000 range and a complete rifle made in early 1906. The '06 rifle was been rebuilt after WWI, and still has it's original high wood stock and a 1-19 dated Avis barrel.
I would hazard a guess that the OP's rifle likely has been rebuilt at least once and if it has, it is going to be worth roughly what any other rebuilt '03 in similar condition would be worth. But if it is still original as manufactured, it is going to be worth a pretty penny.