I believe is the bottom plate that was once on the old standard churns, wooden barrel butter churns. I believe it was used as a counterweight. It's made of cast iron and about 7 lbs. The size 10 1/2" across. It's in excellent shape for its age. Original patina never modified or cleaned. Seen advertised for more on eBay.
For more details please CALL Roger Powers at 785-673-9548
(NO TEXT MESSAGES PLEASE).
Price is OBO