Attributions by the 20th Century Glass seller on eBay are often best ignored - he was the worst Holmegaard keyword spammer on there for a long time, with many pieces of nasty-quality Chinese glass listed as HG. In fact, he still has most of it - now downgraded to just generic "Scandinavian glass".
But, generally, most of the glass on eBay listed as Holmegaard... isn't Holmegaard at all.