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Hi Tony
Ken King wrote an article about some of the commissioned Perthshire weights in PCC Newsletter Issue 96. The weight with the green shamrock centre cane is thought to have been produced for a mail order company, but no one has found out which one. They made small editions of various designs for various companies, including: Union Bank of Switzerland, Adams Bank, Scottish Gas, Glenside Organics, Moritex Corporation, Avita Corporation. As noted various designs for Selman; a Teddy Bear for Harrods; a closepack for Stone Gallery... the list goes on. They also made a good number of one-off designs, either to order or as designs that never went into production. Specialist Perthshire collectors are always on the lookout for these.
Below is an image of what I think is a one-off from 2000, with a black and aventurine ground.
Alan