Agreed!  Even sporters are GREAT shootin' rifles! 

If it were restored with a Krag carbine barrel (new barrels are available from Criterion, but would require work since they're "In the White" and without a front sight post), carbine stock, and all the bells and whistles... AND you stated that it was restored (not original), you could certainly get decent value, especially because of it's documentation... anyway, more than if it remained in it's present condition.  But you're looking at quite a bit of work too.  Carbine parts are sometimes available, but an original carbine barrel might be a tall order!

My biggest question is why did someone remove the carbine barrel and install a 1903 barrel... and why with (what appears to be) a Stokes Kirk banded sight?  I agree with Local Boy that it may be a Stokes.  They may have gotten a hold of it with a damaged barrel, and (not knowing or caring about the historical provenance) rebuilt it for sales from their catalog.

Anyway... Great find, even if it IS sporterized!