I did not know of that particular item for the 1903. I think his price is high. Good luck to him selling that. Although, I knew a guy (I think he may have died - I haven't run into him in a while) who was a serious collector and had paid $1,300 for an original scope to put on his all matching numbers and parts collector grade 1903 rifle. He wouldn't tell us what he had paid for the rifle. . .
It was a shooter though and he pulled it out once or twice a year to shoot the thousand yard match at Perry and sometimes Quantico.