I don't know whether others consider modern Champions to be WV swirls. I just can't imagine not including them, so I do. I'm not sure what others do about modern Champs. And I don't now if others include Mid-Atlantic swirls in with WV swirls.
Beyond that, I only knowingly include marbles actually made in WV. Amsterdam swirls are made in Amsterdam, so they're not WV swirls. Vacors are made in Mexico, so they're not WV swirls.