What is my stamp worth?
If you’ve ever held a U.S. stamp in your hand and wondered, “Is this just face value—or could it be a gem?”, you’re asking the right questions. Let me walk you more deeply into how U.S. philatelists look under the microscope (figuratively and literally) to distinguish a 2¢ Washington stamp from one worth hundreds or thousands.
We’ll delve into U.S.-specific quirks, what to look for (not just what to know), and how to use your tools (eyeglass, watermark tray, etc.). I’ll keep it friendly—but with the precision you’ll need as you grow into this hobby.
Why U.S. stamps have special nuances
The United States has a rich and technically diverse stamp-issuing history. Because of this:
- Early U.S. stamps were printed in multiple printings, plate varieties, perforation gauges, and paper types, so subtle differences often define value.
- Techniques like grills (in the late 1860s–1870s) were used to prevent reuse; some grills are extremely rare.
- Overprinting, color shifts, and printing errors (such as omitted colors, inversions, or doubled impressions) are common enough that even seemingly “normal” stamps can hide secret variants.
- The U.S. used watermarks, laid vs wove papers, and different gum batches across issues—so specimens of the “same” Scott number can vary significantly in quality and value.
Because of that complexity, grading U.S. stamps is often more demanding than many “common issue” stamps of other countries.
What features to inspect (and how) — for U.S. stamps
Below is a my “field guide” to what any collector should look for when examining a U.S. stamp. Think of this as your checklist.
| Feature | What to Look For | Tools / Tips | Why It Matters (in U.S. context) |
|---|---|---|---|
| Centering / Margins | The design should be as balanced as possible within the perforations. No side should be grossly tight or cutting into the design. | Use a loupe (10×), ruler or measuring grid. Compare margins top, bottom, left, right. | U.S. collectors are very strict about centering; many U.S. issues were printed close to edges or in tight spacing, so “perfectly centered” examples are rare and prized. |
| Perforations | Check each “tooth”: are any missing, shortened (“short perfs”), pulled (where a bit of paper is torn), or damaged? | Backlight the stamp (hold up to lamp) to see “nibbled” or incomplete perforations. Use magnification. | Some U.S. stamps had very fine perforations or variations in perforating machinery. A stamp with full, clean perfs is much more desirable. |
| Grills (for certain U.S. issues) | Grills look like small indentations (dots) in the paper surface. Count rows/columns of grill points; some grills are “up” or “down.” | Use magnification and hold against a soft light or watermark tray. Use reference catalogs that list grill types. | Some U.S. grill types (e.g. Z-grill) are extremely rare; their presence turns a “common issue” into a blockbuster. |
| Paper / Watermark / Type of Paper | Is it laid or wove paper? Is there a watermark? Are there paper “blotches” or pulp inclusions? | Use watermark fluid or watermark trays. Use side lighting to see surface texture. Consult stamp catalog references. | U.S. stamps often have multiple watermarks or paper types (e.g. Bureau plate issues vs private contractor issues). The “wrong” watermark or paper might devalue your stamp significantly. |
| Color & Impression | Is the printing crisp and the color strong (vivid)? Are fine lines clear? | Compare to catalog or known good examples. Use magnification. | Worn printing plates, faded inks, or weak impressions reduce desirability. Some U.S. varieties exist only in certain color shades; mis-identified shade vs error distinction matters. |
| Gum / Back (for mint U.S. stamps) | Is there original gum across the surface? Are there hinge remnants? Regumming? Discoloration? | View the back in a well-lit area. Tilt under low-angle light to see gum texture or signs of disturbance. | With U.S. stamps, “MNH” (Mint, Never Hinged) is a gold standard. But many old U.S. stamps are unlikely to survive in that condition. Any evidence of regumming or heavy hinge damage is taken very seriously. |
| Cancellation / Postmark (for used U.S. stamps) | Light, neat cancellations (ideally off the design) are better. Fancy or rare cancellations (e.g. fancy corks, star cancels) can be premium. Avoid heavy, smudged strikes or pen cancels that obscure the design. | Use magnification. Learn U.S. cancellation types (e.g. duplex, starburst, machine, fancy). Compare with reference books/catalogs of U.S. postmarks. | U.S. collectors often prize “clear strikes” or “centrally placed but clean” cancels. A rare postmark from a small U.S. town or a fancy cancel carved by a local postmaster may push value upward. |
| Faults / Condition Issues | Look for creases, bends (often visible under backlighting), tears, thins, stains, “toning,” repairs. | Hold stamp at angle under bright light. Use backlighting to highlight thins/creases. Use a clean, soft surface and no stress on the stamp edges. | Even small faults hurt value sharply. A dime’s difference in value might become dollars. Sometimes a “fault” stamps still has value if it’s extremely rare—but usually only in the context of scarcity. |
| Margins / “Jumbo” Margins | Some U.S. stamps, especially older issues, were printed with generous spacing; “jumbo” margin examples (i.e. larger-than-typical margins) are prized. | Compare margin widths to common examples or catalog standards. | A beautiful U.S. stamp that “stole” part of adjacent margin can fetch premium. Some grading systems even add a “J” (jumbo) modifier. |
U.S. Grading scales & how “scores” work
Knowing features is one thing; interpreting them in a grading framework is another. Several U.S.-relevant grading frameworks exist; here are some guidelines and caveats.
- ASG grading scale (1–100) is one of the better-known ones. A score of “Gem 100” is reserved for absolutely perfect condition; “Superb 99” is nearly indistinguishable from that but with minuscule issues (e.g. slightly off centering, minor ink spot, etc.).
- PSAG / PSAG-based criteria: PSAG (Philatelic Stamp Authentication & Grading) uses a process where centering is calculated by measuring distances from perforations to design in eight places. This “balance quotient” is then converted to a 50–100 grade scale.
- Many U.S. collectors and dealers still use adjectival grades (like “Fine,” “Very Fine,” “Extremely Fine,” “Superb”)—especially for older or classic issues (19th–early 20th century). Centering is often THE dominant component when applying these adjectives.
- A nuance: the centering / margin “cap” rule. Even if a stamp is perfect in every other way, severe off-centering generally places a hard upper bound on its grade. Meaning: you can’t call a stamp “Superb” or “Gem” if the design is badly off-center, no matter how perfect the rest of the stamp is.
- Grading services will often append modifiers for gum or cancellation state: e.g. “OGNH” (original gum, never hinged), “OGPH” (original gum, previously hinged), “used, neat cancel,” etc. The numeric grade typically refers to the front / design quality; the modifiers explain the back or cancel attributes.
Because grading is never 100% objective (the human eye, lighting, personal biases play a role), differences of a few points can vary between graders and auction houses. But understanding the rules gives you tools to negotiate, spot fair vs inflated pricing, and grow confidence.
Keep in mind that only a philatelic agency with trained experts can grade a stamp. Graded stamps come with a graded certificate and are often in special cases or frames. While you can use the adjective grades mentioned above, be careful about stamps listed on places like eBay as “graded” but have no certification.
While we’re talking about eBay, let me say this; just because you see a stamp that looks like yours listed for $2,500 on eBay does not mean your stamp is worth that much. Most of the stamps I see listed on eBay for high amounts are not worth what they are listed for. Most of these are listed by people who don’t know how to grade or identify stamps and are incorrectly assuming they have a the “valuable version.”
Examples (mini case studies) — what to praise and what to suspect
- A 2¢ Washington from the 1920s
- Suppose it has rich color, sharp printing, full and clean perforations, and a light, neat machine cancel placed near a corner (not across Washington’s face). If its design is decently centered (though not perfect), this could be a solid “Very Fine used” example.
- If someone claims it’s “Extremely Fine” but the margins are lopsided or one side nearly crowds the design, that’s suspect.
- A late 19th-century U.S. stamp with grill
- If you find a grill (say you detect indentations under magnification) and it matches a scarce grill type in reference catalogs, that could add substantial value even if the centering is slightly off.
- But also examine for tampering. Some dealers have tried to simulate grill impressions or alter a non-grilled stamp to mimic one. Compare with authoritative grill examples in reference books.
- Keep in mind grills are common for stamps in this period. Simply having a grill does not mean $$. More often, stamps from this period without a grill are the valuable ones. But be careful, it can be really hard to see a grill on a stamp that was used 130 years ago! (remember the incorrect eBay listings above)
- Mint USA 20th-century issue, never hinged (MNH)
- The gum should look undisturbed, without hinge traces, no cracks or “gum bends.”
- Original gum should be even; no spots of regumming. A regummed or partially regummed gum might show mismatched sheen, soft gum edges, or missing gum in places.
- A stamp with perfect front design but compromised gum (say a small hinge remnant or discoloration) will be graded down by the modifier, even if the design side is nearly perfect.
- A fancy cancellation on a U.S. stamp
- Consider a 19th-century issue canceled with a carved “fancy” postmark (e.g. starburst, cork cancel with pictorial design). If the cancel is clean and doesn’t obscure the main design, it may command extra premium among cancel enthusiasts.
- Compare the cancel strike with known catalogs of cancellations. If it matches a rare cancel or a postmaster’s unique mark, that may elevate the particular stamp’s value above others in similar condition.
Below left is an example of an offset stamp with a fancy “star” cancel. The image at right is the back of that stamp showing it was once hinged. the grill marks are slightly visible below the hinge, slightly to the left.
Practical tips & “gotchas” for U.S. collectors
- Always compare side by side. For U.S. stamps, comparing your specimen with images of known high-grade examples will train your eye faster than reading lists of qualities.
- Use a decent loupe, watermark tray or fluid, and soft lighting. Even a subtle thin or crease can be hidden from casual glance.
- Beware of reperforation / altered perforations. Some unscrupulous sellers have added perforations or trimmed margins to “improve” appearance. A perforation that looks too uniform or new (compared to the wear on the rest of the stamp) is suspicious. Grading services usually refuse altered perforations.
- Watch for gum reapplication (regumming). One sign: gum stops abruptly near the perforations; or the gum sheen looks different under tilt or light. Sometimes regummed stamps feel “slicker” or have gum pooling.
- Be cautious with rare stamp claims unless there’s verifiable provenance or certification. Even professional grading can be reversed sometimes.
- Don’t obsess only on “perfect” stamps—some of the most interesting and collectible pieces are ones with a charming, well-centered cancel, a small quirk, or a variant that history forgot. Condition matters, but story and rarity do too.
- As your collection grows, consider submitting your top-value U.S. stamps to a reputable grading or expertizing service (e.g. PSE, APS, etc.) for a formal certificate. That adds confidence when buying or selling.
Questions about getting started on your collection? – Reach out via email!