No doubt, there are plenty of examples of Ithaca guns exhibiting change overs. Often frames, lock up, pins, barrel steel, engraving, etc. have been blended to use up inventory. I just happened to find this one while laughing at the "rare" comment.... till I looked at the pics, or are there others?

http://www.ivorybeads.com/site/default.a...&FSID3=2801

No, I do not own the gun, nor did I sell it. I'd be out shooting birds if my dog didn't have a hole through her foot.
Just another aficionado.