"Found this buried. It’s flat on one side, concaved on the other and has a hole right through the middle"
A: "This is likely to be a prehistoric or Roman quernstone. This would be the top, a spindle would connect it to a bottom piece and grain would be poured into the ‘funnel’ on top and ground between the two stones to make flour."
If I remember correctly that's a book holder, two straps are used to hold the books and that's the handle.
Used on a siphon hose to keep air from entering the vine wile not used, thus preventing vineger growth.
My Dad had some, he'd get them out when we went ice fishing!
Don't Google it, Duckle it!