Actually, they could very well post-date the death of the king as Kastrup-Holmegaard were a bit tight when it came to ditching their packaging and labels. As a brandname, Kastrup-Holmegaard should have only been used on wares between 1965-1970, when the 'Kastrup' part was dropped from the logo in their marketing / catalogues.... however, the company was still registered as Kastrup-Holmegaard until 1975 and much of the old packaging, dead king and all, was in circulation until that year.
I have one or two sets of boxed glasses where the packaging bears the old-style logo/title, but the labels on the pieces inside bear the newer logo, and vice-versa, so they weren't very picky about a coherent look. This seems to have been down to the fact that the factory was strapped for cash - in 1972 they have just built their biggest plant to date, the F5, and were hit by the energy crisis the following year causing the closure of several furnaces over the next few years, some temporarily and some pemanently (as with the closure of the whole Hellerup plant in June 1975).
As for the taper-holders, they were designed c.1960, and these examples were produced at some point between 1965-75.