Older rusted Rears Mfg SPF 84" 960 blades Flail Mower worth/value?

While looking for a used flail mower for grass and brush cutting on my kubota m5 I found this:

Model SPF84K960LI5R (84" WITH Y STYLE BLADES)


What should I pay for this thing?

 

I originally offered 2500.00 but now after seeing the up close pics and under carriage it looks pretty well corroded up.

 

Attached Thumbnails

• 
• 
• 
• 
• 
• 
• 

Older rusted Rears Mfg SPF 84" 960 blades Flail Mower worth/value?