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I have a pretty little mini paperweight which looks very like a Perthshire piece, but I cannot spot it in the book (which may be me being incompetent....

) Top facet and 5 side facets, concave polished base. It has a centre 'J' cane, but I suspect that is the Perthshire date cane for 1978, rather than the J Glass signature cane - it does not look quite right for one of theirs.
Diameter 1 1/2 inch / 39 mm; height 1 inch / 27 mm.
Anyone know who made it?
Alan