What kind of IC is "ATMLU324" "16B 1" "Z8J0534B"?
It looks for all the world like an Atmel AT24C16B, a 16kbit two-wire serial EEPROM chip.

In particular, page 14 of the datasheet has this diagram explaining the markings on the DIP version of the chip:

                      Seal Year
                       |  Seal Week
                       |   |   |
 |---|---|---|---|---|---|---|---|
   A   T   M   L   U   Y   W   W
 |---|---|---|---|---|---|---|---|
   1   6   B       1
 |---|---|---|---|---|---|---|---|
   * Lot Number
 |---|---|---|---|---|---|---|---|
   |
  Pin 1 Indicator (Dot)

Y = SEAL YEAR             WW = SEAL WEEK
 6: 2006  0: 2010          02 = Week 2
 7: 2007  1: 2011          04 = Week 4
 8: 2008  2: 2012          :: : :::: :
 9: 2009  3: 2013          :: : :::: ::
                           50 = Week 50
                           52 = Week 52


Maybe you were simply sent the wrong part by mistake. Or maybe the seller tried to scam you with a cheaper (or counterfeit) part.