Ithaca made some fine shotguns. I owned a NID in 16 ga for years, finally selling it ,mostly because it didn't fit me all that well and I missed too many shots with it. It was, in fact, very well built and it still had quite a bit of the case hardening colors along with barrel bluing that was close to 100%. Ithaca also made an earlier SxS called the Flues Model.The Flues was not a strong as the NID and sometimes had short chambers. Do you know which model you are looking at?