Source hierarchy
Manufacturer documentation, grading/authentication service rules, marketplace sold records, museum/conservation guidance and specialist references are preferred over unsourced collector folklore.
Market evidence
Active asking prices are not treated as value. Articles should distinguish asks, completed sales, auction results and user-entered calculator inputs.
Authentication language
Generic packaging clues are framed as evidence or red flags, not verdicts. Category-specific manufacturing knowledge controls.
Corrections
Material errors should be corrected promptly and, when useful, noted in the affected page.