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For all but the specialist the trend is to ignore per-forations on stamps as a means of differentiating themfrom each other but the practice still is strongly en-trenched for United States issues. But, whatever the trendmay be, the beginning collector should learn the use of the perforation gauge for it is often a useful means ofdistinguishing a spurious stamp from a genuine, it is aninternationally accepted standard of measurement, and itis part and parcel of stamp lore. In another chapter we discuss the various kinds ofperforations and how they are made. The Watermark Detector Primarily as a protection against counterfeiting, manystamps are printed on paper watermarked with some sortof device. All adhesive stamps of the United States wereprinted on watermarked paper from 1895 to 1916, andall United States embossed envelopes are on water-marked paper up to the present day. |
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