Early Version
Here is a really interesting version. It’s the earliest unicycle I found on the site, but it’s not a typical uni.
http://www.google.com/patents?vid=USPAT246031&id=BcxLAAAAEBAJ&pg=PP2&dq=unicycle+1880
Here is a weird one. It appears from this patent that the modern unicycle was patented in 1961 (ha!):
http://www.google.com/patents?vid=USPAT3083036&id=4b1wAAAAEBAJ&pg=PA1963-IA1&dq=unicycle+1885
I like this apparatus since it can teach uni OR hand-walking (but not both?):
http://www.google.com/patents?vid=USPAT3580569&id=P8NfAAAAEBAJ&pg=PA4&dq=unicycle+1885