"1. LAID PAPER – Has the appearance of parallel lines in the paper, which can usually be observed when the stamp is immersed in watermark fluid, with the lines appearing darker than the spaces in between the lines. This is caused by wire cloth used in the papermaking process. Laid paper usually cannot be detected outside of wmk fluid, at least on U.S. stamps. Some foreign stamps were printed on laid paper where the lines can be seen with the naked eye, but as far as I am aware, no U.S. stamp on laid paper can be detected out of fluid."
That reference is in an article on 1851-77 era stamps, not the stamp you are considering. If you are buying uncommon US stamps (given your posting history here) I would recommend using quality dealers and/or stamps with certifications. Buying this kind of stamp from unknown online sellers without a cert is going to result in very questionable stamps with minimal value (others will not pay much for what you accumulate without certs). Don
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