my resent ebay purchase (too good to be true) gave way to google time on my mac. what i found is of concern - well, to me anyway.
my specialized 06 s-works langster frame (freshly purchased on ebay) is eerily similar to a generic track frame offered in a catalogue from a mass producing manufacture of cycling goods from asia.
"currently supply to global customers and many of them are the most reputed bicycle assemblers, such as Jamis, DMR, Ritchey, Surly, QBP, Planet X, Dawes, Greenspeed, Rans, Da Bomb, VooDoo, Sachs and so on."
not uncommon these days to be sure, however:
a.) an s-works langster track frame is made from top-shelf "columbus SLX" (as stated on specialized website)
b.) the ar7048 track frame, from common "7005"