I called them and someone of the staff checked, if it had a low-c on the right side. It didn´t. Still the price seems ok.
But to me it doesn´t make much sense. I´m quite happy with my 46 keys, I played it for two and a half years now and it served me well. still I´d like to have these extra notes. I fancy, that with a good 57 keys, I don´t need another one. But well... two and a half years ago, I could not possibly imagine that I would be willing to pay so much money for a concertina...