You would need to verify that it's all original.... a lot of the old GI .45s were mutts, with parts scrounged from all different makes. Yours looks pretty good, but if it's not all matching parts, the value goes in the toilet.
Blue book values for an Ithica 1911A1 (if it's all proper)
98% $1400
95% $1050
90% $825
80% $725
Hard to tell from the photo, but yours looks like it's between 80 and 90%