Great coin, RD. Be sure to handle it by the edges only. No fingerprints allowed!
You have a gold sovereign 1892 with Saint George the dragon slayer on the reverse. There are also half sovereigns that have a different reverse. Your coin is 'worth its weight in gold.'
Gold sovereigns contain 0.2354 troy ounces of gold. At the time of this writing, current gold value is about $1000 US dollars per ounce, so your coin is worth 0.2354 times $1000, or $235. The value of gold varies daily, so be sure to look it up on web sites such as kitco.com. Collectors often pay more than gold value for coins like this, say $100 or so more, but only for coins that are in excellent condition like the ones in the picture.
CoinQuest thanks Chard in Lancashire, UK for use of their coin photo. If you are interested in coins like this, check out Chard's taxfreegold site. It is loaded with information about these beautiful coins.
When selling your gold sovereigns, expect to get offers from dealers at levels well below the gold value. The resulting mark-up is required to keep the dealership solvent.