For information on old Ithaca shotguns, I suggest:
www.ithacagunrepair.com
Lots of information on all models including serial number/date charts, etc.
They specialize in repair and restoration of old Ithaca guns.
Lots of good information.
I have an old 1909 Flues model I picked up for a couple of hundred bucks. It's worn and the end of the barrels have been cut off, now 26", so no chokes but I always wanted one as I grew up about 50 miles from the factory. It is labeled fluid steel barrels. I have used very light hand-loads without problem and now have loaded 100 brass hulls with Pyrodex for use in this old timer. Just a fun thing.