Determination of a toilet bowl or toilet seat

Dear experts, can someone tell me what kind of toilet this is (see photos) or which toilet seat fits it? I somehow can't find anything. The toilet seat here is not fixed to the bowl by two holes as usual, but the mounting is integrated into the bowl – two metal brackets come out here. Thanks and greetings Ashley

Maybe you should tell what kind of house you bought. Then it might be possible to assign the installed objects ;)
Regards, Yvonne