The CZ-1 I bought in the late 90s was $300. It was offered for $450. I called the guy in Seattle and asked, "if I drive up there right now with $300 cash in my pocket, will you sell it to me?" He said yes. I feel hat if your CZ-1 is in very good condition, you should be able to ask $500+ for it.
when in doubt, go to E-Bay and look at what that market is asking. Bottom line,,,, DON'T SELL IT! You will regret it.