Your catt looks a bit like the BLC Chia Lin -(photo attached) but there are so many hybrids around these days, you will have a problem getting the original registered grex. Treat it like you would your Catts - regarding feed and water, and you will have many years of joy from it - pedigree or not. The Den is a fine specimen but it will be impossible to id - also because of cross breeding. Feed often during growing season and reduce water in winter - you will end up with a spectacular plant covered in blooms come flowering time. Do not get over enthusiastic about repotting and dividing, Dens want to be potbound and the more plants in the pot, the more flower spikes. Only remove keiki's when their roots are about 2,5cm long.
I hope this helps