This is the late 2013 iMac. It comes with high serria and NOT Mojav. 1 very disappointing fact is that the IMAC comes with a SATA drive 1TB and NOT a Solid State drive. Still, have to find out what else the company lied about. The apple mouse of the very old design and NOT the magic mouse. Have reported but no reply from seller.NOT 16 Gig as advertised rather only 8 gig ram.  Iris Pro 1536 MG Graphics, NOT Intel Iris Pro 5200 Graphics as advertised