I'm not sure how much help you'll get from this site. Almost all of us are bowling ball users, and while we may have collections of bowling balls, we keep the ones not in current use under the bed, in the garage, or some place else where our families won't realize how many we've accumulated.
The name Everclear isn't familiar to me so I would think its fairly rare. If you could post a picture of the ball I'll let you know if I've ever seen one before.
As for value, the most valuable balls would be ones that were popular but have recently been discontinued, since these balls would probably still perform well on the right lane conditions. I haven't yet run into anyone who buys old balls just to display them.
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