Actually, fairly sure that it's not Holmegaard after looking closely at the rim in the first photograph.
It looks to have a small ridge of glass running around it, meaning that if it was made at Holmegaard it would have to have been cracked off hot using the Gerbaud method, which is to say that the glass was inserted into a machine and the excess glass was melted off to the right height by small and very hot flames, causing this small 'slug' around the rim.
When it came to thin-walled drinkware Holmegaard used this almost exclusively on catering-quality glass from the 1950s onwards because it gave a cheap mass-produced appearance. Most retail-quality glass was cracked off cold.