Easy to read "Rutland VT" on the larger of the 2 wheels. I never thought to look at the other piece for writing. Right now we have a foot or so of frozen snow on the ground and the wheel is buried. Next time I walk my dog, today or tomorrow I will check the other part for writing.
There were a number of granite quarries in this area, I am not aware of rock crushing in the past thought one is operating now. The nearest is a good 10 miles from this park. Maybe a farmer reworked it for something else?