I have seen a few Tip Curtis rifles, but of more recent vintage. He does produce them in quantity for sale, and you can tie into one for 1400.00 to 1500.00 or so. My friend has two, and they are solid, serviceable, and good shooters.
That said, I have not seen one with any carving, and the finish is usually quite rudimentary. I am going way out on a limb and guess that perhaps someone bought one, carved and finished it? I think the one you have is the best finished one I have seen by far.
In any event, a nice rifle that will serve you well.
God Bless, Marc