Kind of a pennyfarthing with the big wheel in back
This is possibly an American Star high wheeler, or a replica. They were known for having the small wheel in front, to prevent the forward tipping issue common with Ordinary high wheelers.

If it is an original American Star, it dates from the 1880's approximately, and has serious collector value. If a replica, not so much. :)

They are still considered an Ordinary/Penny Farthing/High Wheeler.