Business Law!!

Smith Gold Exchange Inc., issued a $3500 check to Mary Penchant to buy a purportedly genuine Rolex watch. The check was post-dated (assigned a date later than the actual one). Penchant indorsed the check and presented it to J&J Investments, Inc., a check-cashing service. Without verifying that the check was valid, J&J cashed it. Meanwhile, Smith issued a stop-payment order on the check based on information that the watch was counterfeit. When J&J presented the check to Smith's bank for payment, the bank refused to honor (cash) it. Is J&J entitled to payment as a holder in due course? Why or Why not?