Looks to be unused, once it goes through a commercial dishwasher, the aluminum oxidizes.
Has both the slicing blade and shredder, bonus.
Usually the pivots on the hopper door are shot to hell, common practice is to sleeve a sink stopper tube over the handle for more leverage, when the blades get dull you need it.
But this one is practically new.
I'd start off with $250
This will fit most other mixers as well, most of the share the same hub