Pics won't blow up
Looks like it may have grease fittings.
Disc scrapers are a huge Plus if it has them......like a Grand +
They typicly don't have bearings but rather bushings that the gear spins on.
Look for slop
Take a couple long 4x4's with you so you can pry it off the ground in each corner and see how the discs spin /slop ,etc.
I think your good at 450....perhaps you'll find some points of disscussion to bring it down a touch.
Reality is...your gonna drag it through Dirt and it won't care.
A new similar deere unit is 2k+ iirc
Paint is cheap if you want Green.