Well, its been a year already since I found this stuff, but I'm still near gloating over it. Gotta say many thanks to "Neanderthal" for his advice on using rubber bands and waiting a couple of weeks to dry before trying to clean it out. Turns out its what is called an "Avery Conical Bowl". Here are pics from the day I found it, and from after I got it cleaned out. Hope yall like the pics alright.
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