craigslist bike trends
documented here:
http://http://1.bp.blogspot.com/-gnhixJm-YKU/TxiCBdbb3vI/AAAAAAAAH-8/DAGvu9OUEv8/s400/brettkuckfrankenfarthing.JPG
Also there is a link to research asking prices for bikes on craigslist:
http://priceonomics.com/bikes/
May be useful for some, along with ebay. Too bad there isn't a "completed sales" craiglist option!
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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"