It looks like a sears thrower. I found this ad on craigslist:
http://rochester.craigslist.org/grd/3510483684.html
"I think this fits 70's to 80's sears units, 42 Inch wide"
The auger and housing look the same, so I'm just guessing they are from the same manufacturer (as long as the ad poster has the right info).
__________________
1980 IHCC 682
1980 IHCC 482
75, 78, & 79 IHCC 1650
IHCC 1100
2- IHCC Originals
A Few Big Toys (M, W4, SC, 140, F20, MH101Jr)