Build an Error-Coin Inventory

What this classification means

A structured record for denomination, date, mint, composition, weight, measurements, classification, source, cost, certification, and photographs. A useful identification does more than name an unusual shape. It explains when in production the feature formed, what physical evidence should remain, and which ordinary forms of damage can imitate it.

Diagnostic evidence to record

Use stable IDs and retain the original seller description separately from your conclusion.

Repeatable method: start with Error or damage?, then use the identification workflow and value guide. The page below should add evidence specific to this error class, variety, coin, or damage lookalike.
• Compare with certified examples and mint-production references, not viral price claims.

Common lookalikes and failure points

Memory and filenames alone are poor provenance systems.

A practical examination sequence

1. Confirm the host coin. Identify denomination, design subtype, date, mint, composition, and expected weight.
2. Describe before naming. Write what the metal actually does without using a marketplace label.

Value factors