CHOICE UNCIRCULATED 1853 Queen Victoria Young Head Shield Gold 1/2 Sovereign.  This coin has been professionally graded by P.C.G.S. as MS-64.  This grading gives it a tie with one other 1853 Half Sovereign graded by P.C.G.S. as MS-64 as well.  

It should be noted that most of the coins of this type are maximum grade VERY FINE with the majority found worn nearly slick.