[fintstone]

Originally Posted by drcoastline

Yep, I know what a bollard is and that they come in many shapes and sizes. If you look at the OP photo again and read the description this thing is 12"x12" and weighs about 100lbs. Since Brian states it weighs about 100lbs., I would assume he lifted it off the ground. So whatever this thing is that is it.. There is nothing to sink into the ground. I don't see any holes so no way to fasten it to the ground. Note all the photos of bollards you posted have round tops and the OP photo shows a square. A bollard would not have a square as that could snag the eye in a line. The concave top would also allow a line to rest as opposed to side over.

I would not be surprised to see the underside hollowed out to fit over something like a post. The concave nature of the top also leans toward retaining something, like a person's neck, let their head hang over and whack or maybe a series of these in a row that you maybe would lay a rail on or a telephone pole or spar, so it won't roll while it is being worked on?.

Why are you sure that is the top? As noted in my other posts, it appears to be the bottom to me. The other end is quite round and the part you are calling the top matches the base in many of the bollards I posted photos of that are welded on or sunk in mortar. The way it sits in his yard is not necessarily the way it was in use. A 12x12 base for a bollard seems reasonable to me.