A useful inventory links each item to identity, condition, location, cost, certificate, and images.
Identification rule: record what is visible before assigning a catalog number or value.
What to record
- Unique inventory number.
- Catalog system and number.
- Mint/used status, gum, cancel, faults, and grade.
- Album or box location and provenance.
What commonly causes mistakes
- Spreadsheet rows without images can become ambiguous.
- Renumbering breaks old records.
- Dealer labels should not replace your own record.
A practical research sequence
- Assign permanent IDs.
- Photograph front, back, and certificate.
- Record acquisition and disposal history.
- Back up locally and off-site.
Condition and value
Value depends on exact identity, condition, centering, gum or cancellation, faults, certification, demand, and a defensible comparison set. A famous design does not automatically make an individual example rare.
Compare current collector listings
Use listings to study descriptions, scans, certificates, and market supply. Asking prices are not completed-sale evidence.
Compare collector listings