Nice coin, Mysty1! You have either a crown or half crown from Great Britain. Both these coins look the same, but their size is different:
CROWN: 38 mm diameter
HALF CROWN: 31 mm diameter
Half crowns that look like our picture were minted from 1839 to 1887, while crowns that look like our picture were minted from 1839 to 1847. This page applies to half crowns and crowns between these dates.
The coin in the picture is in wonderful numismatic condition, with very little wear and no scratches, spots, stains, or evidence of cleaning. It is from eBay seller Bondorana, who has a lot of nice coins for sale. Here are some approximate catalog values for these coins:
CROWN (38 mm diameter, 0.841 troy ounces silver):
average circulated: $125
well preserved: $800
fully uncirculated: $3000
HALF CROWN (31 mm diameter, 0.42 troy ounces silver):
average circulated: $60
well preserved: $150
fully uncirculated: $400
half crowns dated before 1865 are more rare and are worth about twice these values
half crowns dated 1841 are very rare and catalog about $800 in average circulated condition
half crowns dated 1843 and 1848 catalog near $250 in average circulated condition
These are inflated catalog values. To understand how catalog value relates to actual value, please click our Important Terminology link at the upper left.
CoinQuest thanks Bondorana for the use of their coin photo. It's a beauty!