Ya, aerator or tined cultivator.
Tines don't seem quite long enough for true aeration but it also seems to have too many sets/gangs for simple cultivating. Non-adjustable and seem to be staggered to cover entire width of the tool.
Worth? Couple hundred maybe if it's free-wheeling and in decent working condition. And assuming you can figure out what to call it and how to describe it to a buyer.