Not actually a prop, but a piece of a set, that no longer exists, let alone the stage it was built on.
This is a piece of a plaster column from Stage 28, at Universal. It later became known as 'the Phantom stage.' Back in 2006, when i was working there, I took my brother, who had come out here for work, on a little tour. The doors of Stage 28 were open and no production was using it or shooting on it, so we got to wander to our heart's content.
We walked up the old wooden stairs behind the opera boxes, and eventually made out way to Box 5, too. We then went up to the higher tier. Off to one side was a trash can that had some rubble in it, including this piece. It had likely gotten broken, when some crew member had allowed a piece of scaffolding to hit this part of the set.
I fished it out of the trash, asked the guard who was at the door if it was Ok to take (he said sure) and especially on a day like today, wanted to share it here.