found a piece of erie cast iron

That piece was made in two variations. There are values given in the Haussler book, Griswold Muffin Pans, but they are likely to be higher than what they go for currently. Much also depends on condition, as published values are those for pieces with no defect or damage. If any have sold recently on eBay, the completed listings search should give you an idea of current value.
 
The 1997 Haussler book valued it ~$2000+. The latest revision of the blue book, in 2012, ~ $1200. There are not enough of them around to come up on eBay very often in order to get an idea of real world value, though.
 
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