Shopping for  SP20E's - Is there a way to determine from the Serial Number that it is really an 'E' and not a plain SP20?  All of my SP20E's start with 'FL145xx" so I assume numbers higher than that are 'E's".  Does this make sense ?  Who has a really early 'E' machine that they could check ? 

OT: Does anyone remember 'E-Machine' computers, $299 desktops what a POS