New York Red Slate Pot Calls

[Gobbler Decapitator]

Good evening everyone.
I was looking to get some thoughts from the overwhelming knowledge on this forum in relation to red slate pot calls. My understanding is that most (if not all) red slate used for turkey calls comes from New York. Do any of you guys know who would be a good source for a red slate pot call that definitely uses NY red slate? Thanks in advance for the help!