Hard to say what a good time to sell is. My opinion is the only good time to sell is when you have something to sell for. Meaning a swap of some kind. As in, I want to make a down payment on a house, or anything else you need / want in your life.
What I would not recommend is selling your collection now just because prices seem high.
You never really know what high is. In the 90s people would have told you to sell all the Cobbs you can, people are paying a few hundred dollars a pop! Now those people regret everything.
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