This is a big, bold silver dollar commemorating heads of state George Washington and the marquis de Lafayette. The horse on the back represents a statue of General Lafayette erected in Paris. The coins were originally sold by the mint for $2 US dollars each -- twice face value. They are worth more today.
Here are the values assigned by The Grey Sheet, a conservative price guide for US coins:
worn: $100 US dollars approximate catalog value
average circulated: $200
The abbreviations XF, AU, MS60 and MS65 are numismatic grades that quantify the state of preservation of the coin. XF means 'extra fine' and this indicates a well preserved coin, much better than an average circulated coin. The MS abbreviation means 'mint state' or uncirculated. Collectors have gone so far as to assign MS grades from a low of 60 to a high of 70. MS60 coins have never been circulated, but have distracting marks inflicted during the minting process. MS70 coins are perfect in every way.
Grade is not the only factor that affects coin values. There are many other factors. Be sure to read about them on our Terminology page.