Prelude was H B Barnum's label out of Los Angeles so isn't a boot, maybe it was pressed up because of "oldies" demand for it but it's legal and looks like a mid 60s pressing to me, we had it down as 67 but unconfirmed. I think the Colpix is a misp-reading of Candix. We have a scan of an original Candix test pressing of this (first label but one known copy) in the "New Breed Blues With Black Popcorn" CD. They switched it to the Storm label for release but it was distributed by Candix.