Well you have a 1915 Austrian 100 corona coin. The problem is the year, 1915. According to my rather old Krause catalogue, 1915 coins are restrikes and and should be valued as BV+2% for what should be 0.9803 oz gold. If you check the ebay, they are 2 such coins with 2200$ bid on them at the moment (and several others with over 2000$ price tag). I'm afraid, I'm not the expert to say is authentic or not.
Restrike means only that it probably was not made in 1915, Austria has struck this coin for many years, all with the 1915 date. I think they still make them today. That being said your coin is just a bullion coin, it has no value over the gold content.
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