Key Date 1909-S VDB Lincoln Premium Tier Lookup
Exact independently verified 1909-SVDB premium tiers reference registry lookup in explicit dated independent comparable sales, grade, condition and currency context, retaining source and as-of date. Caller supplies the actual applicable record, including qualifications, exceptions and uncertainty; illustrative examples are not authoritative records. No built-in complete/current data, eligibility, authenticity, legal/coverage determination or advice.
Description
A key-date premium depends on the attributed issue, condition, grade and dated comparable sales.
A key-date premium depends on the attributed issue, condition, grade and dated comparable sales.1
This tool retrieves your supplied issue-specific record and preserves its source, context and as-of date.
When to use Key Date 1909-S VDB Lincoln Premium Tier Lookup
Use this tool to retrieve a recorded reference with its source context. Establish the coin issue, source edition, measurement basis and reference date where applicable.
How to use Key Date 1909-S VDB Lincoln Premium Tier Lookup and understand its results
- Establish the coin issue, source edition, measurement basis and reference date where applicable.
- Enter callerVerifiedSource, callerVerifiedContext, callerVerifiedAsOfDate, callerReferenceKeys, callerReferenceTexts, queryReferenceKey, using the field meanings and rules below, then run the tool.
- Read result. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerVerifiedSource | Caller verified source; supplied assertion retained unchanged, not independently verified | string | Required |
| callerVerifiedContext | Caller verified context; supplied assertion retained unchanged, not independently verified | string | Required |
| callerVerifiedAsOfDate | Caller verified as of date; real Gregorian YYYY-MM-DD date for the supplied record | string | Required |
| callerReferenceKeys | Caller reference keys | list of string | Required |
| callerReferenceTexts | Caller reference texts | list of string | Required |
| queryReferenceKey | Query reference key; use the exact reference token or coordinate domain stated below | string | Required |
Supply nonblank source and context strings of at most 256 UTF-16 units and a real Gregorian YYYY-MM-DD as-of date in years 0001..9999. Provide nonempty aligned unique nonblank reference keys and nonblank reference texts, and query one exact existing key. Return the original matched reference together with source, context and as-of date unchanged. Unknown keys fail. The source and verification wording are assertions supplied by the caller, not checks made by the tool.
result={matchedCallerReference:texts[indexOf(keys,query)],source,context,asOfDate} Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Calculated observation or qualified reference | object |
| result.matchedCallerReference | matched Caller Reference | string |
| result.source | source | string |
| result.context | context | string |
| result.asOfDate | as Of Date | string |
{
"input": {
"callerVerifiedSource": "independently-reviewed-source/edition",
"callerVerifiedContext": "dated independent comparable sales, grade, condition and currency",
"callerVerifiedAsOfDate": "2026-01-01",
"callerReferenceKeys": [
"record-a",
"record-b"
],
"callerReferenceTexts": [
"Caller independently verified 1909-SVDB premium tiers record a",
"Caller independently verified 1909-SVDB premium tiers record b"
],
"queryReferenceKey": "record-a"
},
"output": {
"result": {
"matchedCallerReference": "Caller independently verified 1909-SVDB premium tiers record a",
"source": "independently-reviewed-source/edition",
"context": "dated independent comparable sales, grade, condition and currency",
"asOfDate": "2026-01-01"
}
}
}Limitations and assumptions
Coin identification, reference applicability and measurement uncertainty require separate evidence. A returned explanation or arithmetic agreement does not establish authenticity, a certified grade or a current market value. Reference records and their claimed verification are supplied by the caller; the tool does not retrieve or verify them.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Libertad Onza Key Dates Mintage History Lookup: Libertad mintage comparisons need matched denomination, metal, finish and year records. For a complementary comparison, use CAC Green Bean Sticker Premium Data Lookup: A sticker and a reported premium describe different evidence: certification context and dated sales.
References
Similar or alternative tools
- Libertad Onza Key Dates Mintage History Lookup
Libertad mintage comparisons need matched denomination, metal, finish and year records.
- CAC Green Bean Sticker Premium Data Lookup
A sticker and a reported premium describe different evidence: certification context and dated sales.