The Classic Rendezvous mailing list. Lots of members there interested in buying vintage bikes.
http://www.bikelist.org/mailman/list...ssicrendezvous
A detailed description, preferably with a link to good pictures is recommended. Also, state the price you want; no fishing for offers. And all postings must be signed with your real name, city, state and country, or you'll be booted off the list before you know it.