Looking further on the internet, it is a Steven Pope conversion as Dick said.  I found a thread from here (KCA) in 2014.  The barrel is not marked Steven Pope, but it has a serial number on the bottom of the barrel. 
The post from 2014 talks about a wide dove tailed front sigh as mine has.  Though my receiver s/n is higher than the OP posts.

Still working on it and will get pictures later. 

The stock has a cartouche dated 1901, P proof, 1901 rear sight and hand guard. 

If you removed the 22 barrel and installed a 3040 barrel you could not tell.