Tamid,
The short answer is, if the gun says "Ithaca, NY" on it...it was made by Ithaca.
That covers everything except Syracuse Lefevers which were assembled from parts. A very small (as in "tiny") number of these have Ithaca, NY on them, because the sideplates were yet to be stamped at the time Ithaca acquired the remnants of the company. The rest of them say Syracuse, but have other identifying cues. Most obvious among these cues, are mismatched features per given grades.
There are some other more subtle marks, the details of which have been discussed on Lefever forum threads you can find, if you are so inclined to geek out.
- Nudge
