The coin belongs to Group D of Series X (Class Va). While the obverse is of the Class V type, the reverse no longer has the cross in front the pony and is Class IV. Both V and IV are not really "classes" at all. They are earlier versions of the design Groups referred to above.
Information on Group D
Explain the lyre symbol
c. John Hooker 1996 email@example.com
Here is an example of one of these coins.