<human>: I received this Rolex as a gift from a friend. No box or papers, just the watch. Needing the money for urgently overdue bills, i took the watch to the pawn shop. I told them that i didn't know whether or not it was genuine. After a long inspection, the owner "confirmed" its authenticity and made an offer that i accepted. The next day he calls, saying that he took it to an authorized rolex dealer out of town and that it was deemed a counterfeit. He  now wants me to pay back the money. I no longer have the money as i spent it on bills. Am i legally obligated to pay him back? Did i break any laws? Thanks in advance for any advice.

Summarize the given text in a few sentences.
<bot>: Unknowingly sold counterfeit merchandise to pawn shop, who inspected the piece and deemed it authentic at the time of sale. they changed their mind and want their money back.