Eco Solvent Ultra! you may need to convert ink from Plus to Ultra...
Looks like an RJ6100 however the stand is a bit different than mine.
You must assume everything is wrong with it.
It looks dusty and "non op" so you will need new heads, Ink lines, Dampers, Capping station, Pump for sure. and the ability to change all of these parts. Who knows you may need a mother board??
I'd say about $500