Ah yes. It's an Irish "mine token". There are, almost literally, hundreds of varieties of this token - 185 varieties just with the "1792" date. I don't have a book that lists out the differences between each and every variety, but the book I have does divide the varieties into classes, depending on the number of strings that are visible on the harp - this number can vary between 5 and 14.
Most of the variations seem to be in the edge inscription. The edge quoted by BenByfield above is the most common one; if your token says anything else on the edge then it might be a scarcer variety.
As for value, my book lists the commonest types at £8 in Fine, with scarcer types from £15 to £30 in the same condition, and higher prices for better condition coins; we'd need to see pics of your actual coin to judge its condition.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis