I know it's just a wild guess (and after-the-fact perhaps), but it looks to me like it may be an eyelet or post attachment for a tarp tent....keeping in mind the location and circumstances of the find itself...... (???).
Looks like a wheel to those old metal toy cars
looks to me like a wheel to a toy train
It looks very old. Looks like a cap of some type
Maybe a wheel off of a toy train car.
This one still bugs me!!
Window sash pulley is the closest I have been able to find but then we found one with a screw still in one of the holes that tripped me up again!!