How do I price my wines?

[GUSphinx]

I wish to auction off a dozen or so wines, but would like to know how much they are worth first. How would I do this?

The ages range from '63 to '79.

For example:
1975
Marques de Casa Concha
GRAN VINO
Concha y Toro

[Innkeeper]

You can go to www.wine-searcher.com . Enter your wines to see what vintage retailers are charging, and make your decisions from there.