Plating The 3¢ U.S. Imperforate Stamp of 1851 - 1857

PlateAI is now live on stampplating.com. Upload a scan of any 3¢ Washington — Scott 10, 10A, 11, 11A, 25, or 25A — and receive a ranked list of candidate positions with confidence assessments, alongside side-by-side comparisons against the Chase, Celler, Amonette, and Lund-Amonette-O'Doherty references.

Performance

On a 455-stamp held-out test set:

• 96.7% Top-1 accuracy — the correct position is the top candidate roughly 19 of every 20 times
• 99.6% Top-5 — the correct position is in the top 5 nearly every time
• 100% Top-10 — the correct position is among the top 10 candidates every time

PlateAI doesn't replace philatelic judgment — it accelerates the routine cases so your attention can focus on the genuinely difficult ones. Use it as a second opinion on hard stamps, or to speed up bulk identification.

Built on shared work

PlateAI was developed by David Fussichen using a multi-branch convolutional neural network trained on roughly 9,000 scans drawn from the four reference platings cited above, plus an additional 10,000 scans contributed by collectors. None of this would exist without the expertise and generosity of Robert J. Lampert and Bryan O'Doherty.

Try PlateAI Now →

Free to use; uploaded scans may be retained on private storage to support continued improvement. Feedback is welcome.