All but one of my vases are marked with the label ROYAL BRIERLEY Art Glass. The script Royal Brierley is in blue. One other vase has the label like Terry's (red script) and it says Handmade in Britain.
I have three in the same shape as yours, Terry. The red one, also a bright cobalt blue and a dark, almost black colour.
Then I have the same bulbous shape, but in a tiny little vase (three colours - bright red, darker crimson and blue).
The other shape is the amphora - in two sizes and three colours
Are all iridised. They're all rather special to me as they were bought by my daughter over a number of years. :oops: