This Ithaca manufactured 28" long barrel is for the model M-66 12 gauge Supersingle lever action single barrel shotgun with 3" chamber and is in fair condition exhibiting a brown patina with some original blue finish in protected areas and may have scattered specks of old surface rust. The bore has some pitting and rust and rates fair.  This full choke barrel comes with a brass bead front sight, the early variation extractor (round shank) and extractor spring.   (file photos) 

Note: Ithaca model M-66 shotguns with the following year/serial numbers have been observed with this part: 17010