It's a saddle. Haven't got any photos that are good enough to cross-ref.
It's a 24 hour listing which appeared 2 days after mine was nicked, shitty description and starting at a tenner. The guy hasn't ever sold anything and he suddenly has two high-end saddles to sell.
Tough break, then. If you had photos of it in your possession, had reported it to the police, had a crime ref, and some defining marks then maybe. Even so, it's a saddle, pretty tough. Sorry about that :(
Why can't you prove it? You don't have any photographic evidence of your ownership (nor proof of purchase, etc) ?