Properly, the name is Gulvvase - with two 'v's (in Danish, 'gulv' = 'floor').
Yours seems like a legitimate example in a colourway called 'Coral', produced after 1967-ish.
Telling Holmegaard gulvvaser from similar vases is mostly about paying attention to the shape (similar bottle vases might have thicker cased bases, no flared flat lip, different proportions, etc), and recognising the colours they were originally made in.