Thankyou both so much!
So quick and right on target!
I looked at the etsy description and it said one of a set of 4 plates, each with a different design, so I image searched under Pukeberg 4 glass plates - and sure enough, there it is!!!
I have been scratching my head for weeks over this!
Ace detective team, thankyou!
Oh, and whilst looking at background on Pukeberg, I noticed that Ann Wolff/Warff worked there late 1950s, early 1960s. Too early for these, but maybe I was on the right track with some influences going on there...