Hi,
My first unicycle was a cheap 20" Only One.
I kept it for some years because it allowed me to make people try it. I was myself using a 29" but it was easier to make people try on the 20".
I “traded” it for a pair of inline skates with a friend. I teached her how to unicycle and she teached me roller skating. We eventually stopped meeting and we didn’t swap back our items. I sometimes wonder where is the unicycle now, maybe it is still used, maybe not. 
Wow, that saddle looks nearly identical to the one i learned on.