Most mature one I've seen, though its still not more than 10-ish years old (I think). Didn't get good ID pictures of anything but leaves because I originally wasn't taking them for this.
The lobing is very distinctly linear on some leaves, but on others its shallow enough to look pretty much exactly like red mulberry. The texture of the top surfaces is rough, but not as rough as a pure red. Closer to the texture of what id think is a 50/50 hybrid