Postage stamp errors

How to spot errors in rare postage stamps?

Errors in postage stamps are among the most significant factors that can increase a stamp's value from a few dollars to thousands. Whether it's a perforation error, an overprint, or even a color shift, identifying these differences requires great precision. We offer a free "Comparison Lab" tool that helps you match your stamp to a reliable original to reveal even the smallest differences.

Types of stamp errors you can detect:

  • Shift Errors: When part of the design is printed away from its designated location.

  • Errors in overlaying: Forging old overlays is common; using the tool you can compare line angles and ink thickness.

  • Color errors: Discovering color variations resulting from rare printing experiments.

Overlay Microscope

Combine transparency with microscopic magnification to discover the finest differences and design consistency.

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Waiting for images to upload before starting the superposition analysis…

Note: Processing is done locally on your device for complete privacy.
Overlay Analysis System v2.0 | Supports simultaneous touch and panning | 100% Local Processing

How do you use the error detector?

  1. Upload the reference image: Upload an image of an “original” or “undamaged” stamp from a global catalog in box number 2.

  2. Upload your own stamp: Upload a clear image of your stamp that you suspect has an error in box number 1.

  3. Calibration and transparency: Use the “transparency slider” to merge the two images on top of each other.

  4. Alignment: Use the arrow buttons to precisely align the two images. Any discrepancy that appears when adjusting the transparency indicates a possible typographical error or forgery.

  • Complete privacy: Images are not uploaded to any server; processing takes place only within your browser.

  • Digital precision: The tool allows you to see what the naked eye cannot see through “Overlay Mix” technology.

You can do this by comparing your stamp to a reliable original. Errors include inverted designs, color misalignment, or mismatched embellishments in size and font.

Yes, official and recognized printing errors in international catalogs such as “Scott” or “Stanley Gibbons” greatly increase the value of the stamp.

You can learn more through the tool Postage Stamps inspection

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