Yesterday I emailed a craigslist seller minutes after they posted an ad for a similar looking trek for $65.
Never got a reply - probably for the best, no telling how many round-and-round exchanges were avoided.
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"