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It is perhaps worth adding that lead glass paperweights are somewhat easier to restore than soda glass or more modern pieces, as the glass is softer, and a given sized bruise does not penetrate as deeply. That said, you can still expect to lose up to twice the diameter of the bruise from the diameter of the weight ( ie removing a 5 mm diameter bruise is likely to take 10 mm off the diameter, or 5 mm off the height). Also, paperweight occasionally crack disastrously during restoration - beware of having a 1930s Paul Ysart repolished!
Alan