Can you identify this taxidermy item?

Said not to be a weasel or known cat. But what is it?

The owner, a taxidermist for the last 30 years, writes: “It’s not a weasel. It’s never been Identified. This animal was mounted around the turn of the century. It was typical back then to mount the animals with the real skulls; this still has the skull and real teeth in it. It’s about the size of a cat.”