What's your reference for the late-1950s production of the OB gulvvase? DG 1925-85, as well as a few other sources, state it as 1962.
As you can see of the catalogue Otto Brauer do not appear as designer of the floorvases, it simply says Household articles in 1973-1976 catalogue it says "Art glassware from Holmegaard. Designed by well-known Artists" but no mention of Otto Brauer so I do not think that it has been a easy way to get this "spare time" vase to become a part of production, maybe it all is a coincident that the vase at all became a production item, I don't know.
I know that reference here and there are 1962 and that is what I do my self, but that was more based on the oldest catalogue in where to find gulvvaser and often items can be a couple of years under way before there appear in catalogue, but I am sure that I shall have that changed to perhaps 1958 instead and the source is "Fyns Glasvenner" they specialise in Fyens Glasswork.