This is a
Roman granite (
stone) market barrel
weight.
It is 11.6 lbs (modern) or 5.3 kg. (I can't get any more accurate with the household
scale.)
It is 12 cm tall, 15 cm in
diameter. The flat top
part is 11 cm
diameter.
In the first (top-view) picture you can see the remains of the lead plug that I assume once secured a metal hook in place.
In the second (side-view) picture you can see the barrel shape.
In the third (
oblique view) picture you can see an old
crack down the
side with a short rectangular
grove cut in it that I assume once contained a lead repair plug - these are well known from repair of large
terra sigillata vessels. I place a
sestertius of
Marcus Aurelius on top of it in order to get an easy impression of its size.
SC