Someone help me with the value of a road bike

I run a bike shop in Vancouver BC and we accept bicycle donations for
charity throughout the year. Today a lady brought in a gorgeous older (late
80's early 90's?) Colnago road bike. I know absoutley nothing about road
bikes (besides how to repair them)

I can tell this bike is worth some good coin and I plan to to a raffle for
it during the "Tour De Delta" road race. This way I can get money for the
charity rather than donating them the bike to them (it will end up being
ridden by kids and get wrecked)

Can someone please contact me and I will send out pictures of the
bike/components/gear and hopefully I will get an idea of what it is worth,

Thanks.