Originally Posted by
unworthy1
at the risk of creating another raging flame war about vintage track bikes and the fixie craze...let me very gingerly echo what biblibob said; there may be a LOT of interest in your bike just as-is (sew-ups and all) IF you live in or near a major urban area and/or College town. You should clean and polish it and take some good pics to post on a Craigslist ad, highlight that it's a TRACK frame, it's 531 and a vintage Spanish-built Zeus from '77, show close-ups...actually WE would like to see those pics before you post the CL ad. Your bike *could* be worth anywhere from $300 to $1000, depending on all the factors.
I think it'd have to be in pretty poor shape (i.e. bent or dinged up frame) to be worth only $300. Vintage track frames are much less common than vintage road frames. The frame is probaby where most of the value of your bike lies. That and the hubs and crankset. These are the factors unique to track. Also, it is a very desirable name, regardless of how it was made. I'm guessing they sourced some competent framebuilders. I think your bike is worth closer to $800 in the right market with the rebuilding you've done. The Zeus track crankset alone would probably take north of $120 on ebay, mind you.
There are
TONS of track bikes out there today. Fuji, Surly, EAI, SOMA, these people roll out "track" frames to the young urban public like hotcakes. Inevitably, some of these people will want something older, with more history, and something that was originally intended for racing on the track, not intended as a consumer item. Vintage track frames with real history are so uncommon, even compared to vintage road bikes, that they are very highly valued today, as I think they should be.