When it comes to the cased Gulvase...
A few corrections derived from the original catalogues, rather than incorrect reference books.

Gulvase is in fact an error, and it should be Gulvvase with two v's. Also, this isn't actually a range name, just a description - Kastrup/Holmegaard applied the same name equally to any other large vases meant to be placed on the floor.
And colours...
Kastrup produced cased Gulvvaser from about 1963 until 1965, and they were available in Opal cased in clear, and Opal cased in Selenrød (a dark ruby red). The latter was produced by Kastrup-Holmegaard until c.1967, when it was replaced by Coral (an orangey-red). Opal cased in clear seems to have been in production until at least 1974/5.
Blue/Opal and Yellow/Clear seem to have been introduced around c.1967 too, with Yellow/Clear being replaced by Yellow/Opal around 1974-ish.
No idea when Green/Opal went into production, or how long it lasted for, nor do I have any firm date for when Gulvvase was entirely discontinued.
But that's all I've got so far.