It is as
KurtOlsson says; the only 757 Iberia owns is stored. You are undoubtedly on an American Airlines operated codeshare, on a Boeing 757-223 with the "NGBC" nearly flat reclined seat, as used in the 767-223ER and 777-223ER (but slightly more spacious configuration).
You can read a trip report about this particular flight
here.
Originally Posted by
psyflyer
I am trying to figure out whether or not to take IB on the JFK-MAD leg in J. It says its on a 757 but is the business class seat a lie-flat new product or some older version? TIA