I am sure I have one of these so they can't be worth too much!

I got it handed down from my Gradfather, though, so I don't know the value. It is a pretty neat souveneir of the exposition.
Here is a site with some info (way down the page):
http://www.the-forum.com/collect/wf93souv.htmThey list a value of $75 but that would shock me and it is probably not a value for coin collectors.

The descriptiuon kind of runs into another item so that $75 might not even be for the Treasury one.
Here is what looks like it may be a decent one that is so far unbid at $20 after a week on the Bay.
http://cgi.ebay.com/Antique-Columbia-Expos...1QQcmdZViewItem