The link didn't work, but I assume you mean THESE
I'd spotted them too. I do remember seeing a cased version of these bottles (in Coral/Opal colourway) that was definitely Kastrup-Holmegaard, and it had a shafted ball stopper with it that fitted into the cupped opening. I had just assumed that they were a limited-production variation on the Brauer design - but the labels on this vase, and I do believe they're original to it, should date it to pre-Brauer (1962).
I'm hoping to bid on the one above so I can compare the colour to the Greenland series
, which would date it to 1961. So fingers crossed!