Scott C3a (block format)
E666325
Scott C3a (block format) is a highly prized philatelic item consisting of a block of the famous U.S. "Inverted Jenny" airmail error stamps, renowned for their upside-down airplane vignette and extreme rarity.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Scott C3a (block format) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7461751 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Scott C3a (block format) Context triple: [Inverted Jenny stamp block, catalogCode, Scott C3a (block format)]
-
A.
C-3a
C-3a is a commuter rail line within the Cercanías Madrid network serving suburban areas around Spain’s capital.
-
B.
C-3
C-3 is one of the main commuter rail lines in the Cercanías Madrid network, connecting central Madrid with several southern suburbs and surrounding municipalities.
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C.
C3F
C3F is the official abbreviation for the United States Navy's Third Fleet, a major operational fleet responsible for naval forces in the eastern and northern Pacific Ocean.
-
D.
C3 Presents
C3 Presents is a prominent Austin-based concert promotion and event production company known for organizing major music festivals and large-scale live events across the United States.
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E.
SCT
SCT is the Mexican federal government agency responsible for overseeing the country’s communications and transportation infrastructure and policies.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Scott C3a (block format) Target entity description: Scott C3a (block format) is a highly prized philatelic item consisting of a block of the famous U.S. "Inverted Jenny" airmail error stamps, renowned for their upside-down airplane vignette and extreme rarity.
-
A.
C-3a
C-3a is a commuter rail line within the Cercanías Madrid network serving suburban areas around Spain’s capital.
-
B.
C-3
C-3 is one of the main commuter rail lines in the Cercanías Madrid network, connecting central Madrid with several southern suburbs and surrounding municipalities.
-
C.
C3F
C3F is the official abbreviation for the United States Navy's Third Fleet, a major operational fleet responsible for naval forces in the eastern and northern Pacific Ocean.
-
D.
C3 Presents
C3 Presents is a prominent Austin-based concert promotion and event production company known for organizing major music festivals and large-scale live events across the United States.
-
E.
SCT
SCT is the Mexican federal government agency responsible for overseeing the country’s communications and transportation infrastructure and policies.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
error stamp multiple
ⓘ
philatelic item ⓘ postage stamp multiple ⓘ |
| associatedWith | U.S. airmail service inauguration era ⓘ |
| collectibleConditionAspect |
centering and margins of each stamp in the block
ⓘ
hinging and gum condition ⓘ presence and condition of selvage ⓘ |
| collectingCategory |
airmail stamps
ⓘ
classic U.S. stamps ⓘ error stamps ⓘ |
| color | carmine rose and blue ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| culturalSignificance |
frequently cited example of philatelic rarity
ⓘ
symbol of stamp collecting to the general public ⓘ |
| currency |
United States dollar
ⓘ
linked to:
US dollar
|
| depicts |
Curtiss JN-4H "Jenny" biplane
ⓘ
linked to:
Curtiss JN-4 biplane
|
| designElement |
"Air Mail" inscription
ⓘ
"U.S. Postage" inscription ⓘ denomination numerals "24" in corners ⓘ ornate frame surrounding airplane vignette ⓘ |
| errorDescription | airplane vignette printed upside down relative to frame ⓘ |
| errorType | inverted center ⓘ |
| faceValue | 24 cents ⓘ |
| hasGum | original gum (for mint examples) ⓘ |
| hasName |
Inverted Jenny block
ⓘ
linked to:
Inverted Jenny stamp block
|
| hasOrientationError | inverted airplane vignette ⓘ |
| hasScottNumber | C3a ⓘ |
| isPartOf | Inverted Jenny error issue ⓘ |
| issuedBy |
United States Post Office Department
ⓘ
linked to:
Post Office Department
|
| knownFor |
being one of the most famous stamp errors in the world
ⓘ
high auction realizations ⓘ iconic status in U.S. philately ⓘ |
| language | English inscriptions ⓘ |
| legalTenderUse | prepayment of airmail postage ⓘ |
| marketStatus |
highly prized by collectors
ⓘ
trophy item in advanced collections ⓘ |
| material | paper ⓘ |
| notableFeature |
block format rather than single stamp
ⓘ
contains multiple Inverted Jenny error stamps in one unit ⓘ margins and selvage may show plate number or guide markings ⓘ |
| perforation | gauge typical of 1918 U.S. airmail issue ⓘ |
| printingMethod | bicolor printing ⓘ |
| rarityStatus | extremely rare ⓘ |
| stampIssue | U.S. 24-cent airmail 1918 ⓘ |
| subjectField | philately ⓘ |
| timePeriod | early 20th century ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Scott C3a (block format) Description of subject: Scott C3a (block format) is a highly prized philatelic item consisting of a block of the famous U.S. "Inverted Jenny" airmail error stamps, renowned for their upside-down airplane vignette and extreme rarity.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.