The only way to tell is to grow it on. I may pot up the example in the scan, just for the heck of it, to see what happens. After All These Years I think about half my ivy collection still resides in pots. This really doesn't bother ivy as it makes an excellent pot plant. On the left is a tiny leafed cultivar who I have not identified.
Any tag is long since history.
This is an enlargement of a leaf from the tiny leafed cultivar - probably over two times actual size. It's a really cute ivy and a relatively slow grower. I have not put this one in the ground, so I don't know how hardy it is, but would guess it is as hardy as most H. helix cultivars. Green Man' has a quite unusual leaf shape. Rather face-like to my eyes.