Air cleaner is around the wrong way on the rover.
Id ask $165 for the Rover.
Polish the base on the GMC with some car polish, put new blades on it (19 inch Honda, can buy them at bunnings, $12 a pair) and ask $165 for it as well.
They are both primer start, the rover is sturdy, the GMC is newer.
$180 for the blue Victa (its the same as the late models) plus it looks clean
The old corsair, thats a bit harder, i know how good they are, id aim for $130 or so.
But no one is buyin at the moment. Not good trying to sell mowers when the grass isnt growing.
