VERY NICE !!!!!  VERY COOL !!!!!  I DON'T KNOW WHAT THIS IS SO IF YOU DO , PLEASE LET ME KNOW …..I'D APPRECIATE IT !!!! APPROX. 10.5 X 7.5 INCHES …..BEAUTIFUL OLD PIECE OF MARBLE !!!!!!  IT DOES HAVE A SMALL CHIP ON THE LEFT ROUND END .BEYOND THAT IT'S IN GREAT CONDITION. IT HAS 2 DRILL HOLES IN THE CENTER …..MAYBE SOMETHING WAS MOUNTED ?? FELT BACKING TO PROTECT ANY SURFACE ….NEARLY 4.5 LBS.