I definitely didn't think it was cleaned, I really thought it was a good example with nice details, it's hard to find Seated dollars with this even toned look without distracting marks on the coin. Dealer was asking $900 for it.
I'd say buy a coin if you like it initially, and can't walk away from the deal. Don't buy the coin if you pass it the first time and think about it later. A first impression says a lot and you don't want to get buyer's remorse. There are nice, original examples of Seated dollars out there, you just need to wait a bit longer for them to turn up.