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Hi. I would ignore values in the Charlton catalogue - they are fantasy figures. There are so many Caithness paperweights on the market at the moment that groups sold at auction - including Limited Editions - are selling for a few pounds each. Yours is an early piece, but unless you can find a collector who is searching for one at any price, I think you would be doing well to get the original issue price of £20. Hope this helps, Alan.