<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by BL1KITW:
I have the Starwood AmEx card but there is no SET number of any kind on my new Platinum card.</font>
FWIW, anecdotal evidence (based on experiences of several of my colleagues and friends) says that SET (SP) number associated with having an AmEx Starwood card would appear on their SPG cards only if they were issued a new SPG membership after signing up for the Starwood AmEx.