http://www.marstar.ca/Norinco/YL-12-IJ4.htm
Ithaca 37 clone exported by Norinco of China.
I bought one of these new last year. Extractors wouldn't work reliably.
Jammed 3 out of 15 shells. Tried different shells and all had problems extracting.
Finally, one got so jammed in the chamber it wouldnt come out. Slide went back shell refused to leave the chamber.
Took it back to the shop where I bought it. They said several people had problems with it. Bought a remington 870 home defence model with factory extended magazine instead. Very happy.