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Okay...senior moment exposed!
I thought I had seen something similar to the paperweight which is the subject of this thread...and I was correct. Lurking in one of my storage boxes was the miniature paperweight shown below. It is very similar to the one being discussed, and has some form of centre signature cane. I had tentatively assumed it might be a Perthshire PP32, which was a miniature with varied design, varied facetting, and a centre letter cane indicating the year (eg J for 1978). Mine has what I think is an S cane (which would indicate 1987). However, the canes did not look quite right for Perthshire, so I left it in the 'not sure' category. Mine is really small: 1 3/4 inch / 44 mm diameter, 1 1/8 inch / 30 mm tall. Concave polished base, typical of Perthshire - as is the cobalt blue ground.
So are these both examples of the PP32?
Alan