I remember this vase. We made a small number in my time but it was by no means easy to press. I agree that the colour, although it would be easy enough to make, was not used then and would be 1960/70s.
Re the latter period, I know that a few of you are interested in the personnel as well as the glass. There were two old friends of mine who were around Sowerbys and Davidsons at that time. Ernie Walton, who had been chief chemist at GEC Lemington and Bill Robson, who had also been on the technical side at Lemington and later was in charge of composition at Joblings. Both moved while I was at Joblings (1961-72) to Sowerbys and/or Davidsons. Sadly I can't remember which of them went where and I think one of them swapped over (as I had done) at some stage. Both had had huge experience (far more than me) of a wide range of compositions and colours especially at Lemington and were more than capable (given management support) of making any of the 1960/70s colours which are turning up from both factories.