That's a pretty unusual piece of Mall equipment you've found there! I've done some pretty risky things in my day, but I can't imagine tearing through the brush with one of these land clearing saws.....
I bought three old Malls from a nice gentleman last fall, a 2MG, Model 7, and Model 11- all three ran with no effort other than adding some fuel. Not unusual saws so much but all are in decent original condition and the stuff that came with it is pretty cool. The owner's father had bought the saws new and saved all the manuals, sales/parts receipts, correspondence with Montgomery Wards, and four bags (labelled for each saw) containing parts, Mall tools, etc. Also shown are Mall boxes with chains that had been sent back to the factory for repair/sharpening. There's some 12A stuff in there too, that saw had gotten away at the family's auction years before. I'm new to adding photos to this site, forgive me if they're not right. Not all that computer literate..