H44, I'm not as confident as you are about the gun not being refinished... The barrel does have roughness around the muzzle and seems to have some back at the frame as well. There seems to be a little bit of pitting on the side of the frame below the thumb release also, although that could be dust in the oily finish. Finally, it just "looks" repolished to me... maybe the lighting and the oil on the surface, though. It's hard to tell. A point in favor of originality of course is the case coloring on the hammer and trigger. They both look very strong in the finish department, so maybe it is original. More and closer pictures would help.
Richard, is it an optical illusion in the picture, or do the bottom edges of the grips extend slightly below the frame) I am no expert on old original grips, so I'll leave that judgement to others, but that factor may be important in the determination of originality. Regardless, it's a nice old I-frame.
Regards,
Froggie