29" Custom unicycle

I previously bought this unicycle through unicyclist.com about 7 years ago but can’t find any of the details from when I bought it.

I am fairly sure it was handbuilt by a German (though the person I bought it from was here in the Midlands) - and has an air seat (see photo) with handles, generic looking frame with some very small spots of rust starting to appear and Sunrims CR18 rim (in good shape) with a Big Apple tire.

This has always been a really smooth riding machine and I used to use it to travel into university, haven’t really used it for the last four years. Probably needs a decent service but still feels good overall.

Looking for around £100 ono, any questions let me know