Hey, Norm ... congrats on scoring that very cool OP-fourree (sadly, I don't have an example of that coin-type, fourree or genuine) => ummm, my two fourrees are pretty easy to spot as fakes, eh? (yup, time and erosion caught-up to these two winners) Fourree Kings of Macedon, Philip III 323-317 BC Baktria, Indo-Greek, Hermaios, Fourree Drachm 105-90 BC ... I should probably try and score myself an example that isn't so "obvious" (again, I'm a fan of your new OP-addition)
You can not say how much fourrees are worth in general. You must compare them to solid coins of the same detail and then subtract for added ugliness caused by the amount and placement of the exposed core. Those with no core might be expected to sell for as much as one quarter the price of a solid but a little chip on the face like yours would take that down a bit but nothing like what a peeled area ruining the face would do. For example, below are three fourrees. One is betrayed by very small specks of core; one has quite a bit of exposed core but it is on parts that are not all that disturbing; the last is pretty much trashed. If all three types were equally desirable (they aren't) how much beyond my suggested 75% discount would you expect for each of these? This is a matter of opinion so we are now back to the correct answer: