This is a Millenium Commemorative coin struck in 1896 and re-struck more recently in proof versions. Proof coins are made solely for collectors and have mirror-like finishes. Even though the re-strikes are dated 1896, they actually were made recently.
These coins contain 0.134 troy ounces of silver. An approximate catalog value for a re-strike proof is $15 to $20 US dollars. For the original strikes, here are some typical catalog values.
worn: $12 US dollar approximate catalog value
average circulated: $25
well preserved: $70
fully uncirculated: $150
Use our Important Terminology page to properly interpret these values.