MSHEA Heady Marble (Large)

I do not know much about this piece, one of my buddies threw it in with another item for a trade. I don’t collect marbles except for a few slurper tops. Looks like MSHEA but not 100% certain. Not certain what I should price it at either so feel free to send a message. This marble is much larger than a typical slurper marble and I have a photo of it “in hand” for size referencing. Condition: 10/10