I've got gold and silver foiled pieces, all in the later jewell-like blue. A stoppered perfume, (with matched ground stopper) and a medium large globe.
They're later than the '70s. I'd think well into the late '80s/'90s at earliest. I've seen them with plastic labels.
The Mdina script on the base of my large globe is unusual, all in capital letters. No date on mine, which is what I, like Christine, think is a date.