Richard Kiusalas made two different specialist stamp gauges: One for Canada stamps and one for U.S. stamps. The U.S. gauge is hard to get. The Canada gauge is still available while supplies last at https://www.csdastampauctions.com/l...-gauge/44038
I've wondered about the usefulness of this item for some time now. Especially with used stamps shrinkage or expansion. Hinges, multiple hinges, soaking and resoaking etc. With all of the stress a stamp may have suffered over countless years, accuracy may be in question.
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