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Middle Tennessee advice needed

I have a gravely pro15..... It is as tough as a bull, and mows great.. I've got on my mind to sell it or trade for a WB...... It is an older model, I may just keep it and mow those one time yards... Does anyone have any idea what I should ask for it?
 
oops it's a pro50 not 15....
 
16hp..... It's shaft driven.......... almost like a tractor.....
 
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