I picked up a Gravely Commercial 10a last Friday. The old thing smokes like Snoop Dog but it gets the job done. The person I bought it from used it for clearing brush. That's my plan too. Did a great job during the first run-up at home.
I need to find the serial number to look up the manufacture date. They started manufacturing the C-10 in 1951. Considering it's age, it runs about as well as I do.
It'll need a little TLC but it does the job.