What you have is an Oregon Boot made by William Leininger patent #177,406 which was issued May 16, 1876. There should be markings on the top side of the donut that show "PATD MAY 16'76" if still visible. In regards to the history of the Oregon Boot, you can go to the SEARCH on this sight and find many neat references to this item.
If you're wanting a price check on such item...well condition certainly does matter...and it's worth whatever a collector is willing to pay. Know that what it's worth to someone is not always what it's proper value is. I will leave any specific suggestions on pricing to the more seasoned collector.