CoinHub Visual Diagnostic Lab
Observe the detail. Test the explanation.
2020-W Weir Farm quarter / obverse
Photo credit and adaptation
PCGS TrueView, certification 42907390. Used with CoinHub's recorded PCGS permission. Display crop and zoom; optional annotation overlays. No coin details retouched.
2020-W Weir Farm quarter / obverse
Photo credit and adaptation
PCGS TrueView, certification 42907390. Used with CoinHub's recorded PCGS permission. Display crop and zoom; optional annotation overlays. No coin details retouched.
Optional photo: session only, not uploaded or saved by this tool. No identity, grade or authenticity is inferred.
Privy mark or mintmark?
Documented design; two views of one coin
On this 2020-W quarter, V75 is the World War II anniversary privy. W identifies West Point. Both are intentional, but they communicate different information.
Evidence limit. The panels show the same photographed coin, not a normal/error pair. Neither small mark is a minting mistake.
Next observation. Record both marks separately. Compare the complete obverse, reverse design and date before naming the issue.
Related Academy lesson
Your evidence record
Keep observations distinct from conclusions. This record is not a certification or appraisal.
Study notes and sources
Privy mark or mintmark?
Privy mark or mintmark?
Documented design; two views of one coin
On this 2020-W quarter, V75 is the World War II anniversary privy. W identifies West Point. Both are intentional, but they communicate different information.
Evidence limit. The panels show the same photographed coin, not a normal/error pair. Neither small mark is a minting mistake.
Next observation. Record both marks separately. Compare the complete obverse, reverse design and date before naming the issue.
Related Academy lessonField or raised design?
Field or raised design?
Anatomy study; two views of one coin
The background in front of Liberty is field. Her cheek belongs to the raised portrait. A surface mark in the field does not become an intended design element.
Evidence limit. This archive coin has no certified grade recorded here. The highlights name locations, not wear, cleaning or authenticity conclusions.
Next observation. Describe where a mark sits before trying to explain how it formed.
Related Academy lessonAt the press or after the mint?
At the press or after the mint?
Source-identified examples; different coin types
The off-center cent has a partial strike beside unstruck metal. The Trade dollar has an added punched mark interrupting its existing design. These illustrate different points in a coin's history.
Evidence limit. Different denominations, metals, lighting and scale; this is a process comparison, not a matched control. The cent crop is only 272 pixels across; enlargement cannot recover missing detail.
Next observation. For a new find, photograph both faces and the edge. An isolated blank patch or punched shape does not establish the cause by itself.
- PCGS: Varieties vs. Mint Errors
- Windrain: Japanese Trade Dollar Photograph and License
- NGC: Details Grading
1984 doubled ear: overview and detail
1984 doubled ear: overview and detail
PCGS-published variety; one specimen
PCGS documents southward doubling at the ear, beard and bowtie for this variety. The target here marks the ear; it does not claim to map all attribution points.
Evidence limit. Both panels use the same PCGS photograph. No matched normal or machine-doubled 1984 specimen is available in this pilot. Rounded versus flat detail is not a universal authentication rule.
Next observation. Check all published diagnostics and obtain sharp, differently lit close-ups. A matching date or one apparent extra line is insufficient.
Related Academy lessonMintmarks move with the design
Mintmarks move with the design
Location study; different coin types
The large P on this wartime nickel is above Monticello. The S on this Trade dollar is below the weight and fineness inscription. Identify the coin type before looking for its mintmark.
Evidence limit. Apparent letter size across these photographs is not a physical measurement. A mintmark alone cannot authenticate an unusual date or metal.
Next observation. Record the full date and denomination, then check the expected position in a series reference.
Related Academy lessonMorgan or Peace reverse?
Morgan or Peace reverse?
Archive design examples; grades not assigned
These archive photographs show different reverse designs: a spread-wing eagle on the Morgan and a perched eagle on the Peace dollar. Start with the whole design, not just the color or denomination.
Evidence limit. These are type examples, not a grade ladder. Lighting, wear and photographic resolution differ. No grade or price is inferred from this comparison.
Next observation. Read the obverse date and check both sides before selecting a series-specific guide.
Related Academy lessonEvidence and image policy
Source-checked educational pilot. No independent numismatist review of this release is recorded.
Existing real photographs from CoinHub's daily challenge bank. No generated diagnostic imagery. Crops, zoom and optional overlays are display adaptations; coin details are not retouched. Images are not shown at the same physical scale.
Sources checked September 18, 2026. Existing photo-bank annotations are reused from the September 12, 2026 release. External references are evidence sources, not endorsements of CoinHub.
No matched machine-doubling pair, controlled wear ladder or cleaning-diagnostic photo set is included. Physical examination may still be necessary.
Error or damage wizard Variety attribution assistant