It's a really lovely little vase!
The Phoenician Glass studio, another off-shoot from Mdina, was founded by Leonard Sullivan, at Sliema on Manoel Island. I'd guess at '70's, not '60's, as Mdina wasn't set up til '68, and it would have taken some
time to train apprentices enough to set up studios of their own!
As the influence of Michael Harris becomes better known, I think all of the artists and studios that owe their origins to him will become more collectable, now folk can "pigeonhole", name and recognise the work.