The Challenge of Look-Alike Stamps
For many stamp collectors, determining the true value of a stamp is not always as simple as matching its central image to a picture in a catalog. Two stamps can look virtually identical at a glance, yet one may be a common definitive while the other is a highly sought-after variety. Subtle physical characteristics, such as watermarks, minor inscription changes, or tiny date markings, often serve as the dividing line between common issues and scarce, valuable printings. While digital tools like StampSnap can assist you in organizing your collection and suggesting a likely identification based on visual cues, confirming these minute variations requires a methodical, hands-on examination.
The Role of Watermarks in Stamp Valuation
Watermarks are security measures incorporated directly into stamp paper during manufacturing to deter counterfeiting. Created by attaching dies to the frame used to make paper from pulp, these watermarks result in thin areas within the paper that form words, letters, or symbols. Because some postage stamps were printed on both watermarked and unwatermarked paper, or on papers featuring entirely different watermark designs, philatelic catalogs assign separate numbers to these variations. Consequently, a watermark can be the sole difference between a highly common stamp and a scarce variety valued significantly higher. For example, United States postage stamps issued between 1895 and 1910 utilized a double-line USPS watermark, while issues from 1910 to 1916 transitioned to a single-line USPS watermark, creating distinct varieties for otherwise identical designs.
Safe Methods for Detecting Watermarks
To safely identify a watermark without damaging the stamp, collectors must use specialized techniques rather than relying on standard lighting. The most reliable method involves laying the stamp face down in a dark tray and moistening it with commercial watermark fluid. This fluid temporarily brings up the watermark as dark lines against a lighter background. While some hobbyists historically used lighter fluid, professional organizations like the American Philatelic Society recommend commercial watermark fluids, such as Clarity, which are safer for both your health and the integrity of the stamp. Commercial watermark fluid evaporates rapidly and will not damage the gum on an unused stamp. Additionally, dipping a stamp in watermark fluid serves a dual purpose, allowing collectors to inspect the paper for hidden faults like thins, creases, or repairs that could negatively impact its value.
Identifying Inscription and Text Variations
Beyond paper variations, minor changes in the text or inscriptions printed on a stamp can completely alter its catalog classification and valuation. These text changes often reflect a shift in the stamp's intended purpose. A classic example of this occurs in the late nineteenth-century issues of North Borneo. The 1886 half-cent rose stamp features the word POSTAGE near the bottom of the design. However, the highly similar 1887 version replaces this with POSTAGE & REVENUE inscribed on a scroll that spreads to the edge of the design. Newcomers to the hobby frequently overlook these small textual differences, which can lead to incorrect identifications and inaccurate valuations of their collections.
Spotting Hidden Dates and Commemorative Markings
In some cases, look-alike stamps are distinguished by tiny dates or commemorative markings integrated into the corners of the design. For instance, under Austrian administration between 1912 and 1918, the earliest stamps of Liechtenstein featured the profile of Prince Johann II. The 1917 to 1918 20-heller dark green stamp was issued as a standard definitive. However, on November 12, 1918, a highly similar stamp was released to commemorate the 60th anniversary of the Prince's accession. This commemorative version replaced the original upper corner designs with the specific year-dates of his reign. Because these dates are incredibly small and difficult to see with the naked eye, catalog listings often include boldface notes to alert collectors to their presence.
Developing an Eye for Philatelic Detail
Successfully navigating these subtle differences requires patience, curiosity, and a commitment to safe handling practices. Experienced collectors know that keeping an eye on the ball, focusing on the smallest physical details, is the key to accurate stamp identification. Historically, some of the world's rarest stamps were not discovered by wealthy dealers, but by inquisitive schoolchildren searching through old family papers. When examining your own stamps for potential varieties, always handle them with professional stamp tongs to prevent oil transfer, and avoid using harsh household solvents. By cataloging your verified varieties in StampSnap, you can build a reliable, organized record of your collection while continuing to develop your expertizing skills.
Frequently asked questions
How do watermarks affect the catalog value of a stamp?
Watermarks can be the sole difference between a common stamp and a scarce variety. Catalogs assign separate numbers to stamps that differ only by their watermark, meaning a watermarked version can be highly valuable compared to an unwatermarked look-alike.
What is the safest way to detect a watermark on a stamp?
The safest and most reliable method is to lay the stamp face down in a dark tray and moisten it with commercial watermark fluid, such as Clarity. This fluid evaporates quickly and does not damage the gum on unused stamps.
How can I tell the difference between the 1886 and 1887 North Borneo half-cent stamps?
The 1886 stamp has the word POSTAGE near the bottom of the design, while the 1887 version features the text POSTAGE & REVENUE on a scroll that spreads to the edge of the design.
What is the difference between the single-line and double-line USPS watermarks?
The double-line USPS watermark was used on U.S. postage stamps from 1895 to 1910, while the single-line USPS watermark was used from 1910 to 1916. These watermarks can be difficult to see and often require watermark fluid to identify.