Treat the envelope as an integrated artifact: stamp, rate, origin, destination, route, markings, date, and contents.
Identification rule: record what is visible before assigning a catalog number or value.
What to record
- Correct rate and franking.
- Postmarks, transit and arrival markings.
- Censor, registration, forwarding, auxiliary, or military markings.
- Sender, recipient, enclosure, and route.
What commonly causes mistakes
- Removing the stamp destroys context.
- A common stamp can sit on a rare use.
- Added markings and fabricated combinations exist.
A practical research sequence
- Photograph front, back, and contents.
- Transcribe every marking.
- Research rate and route.
- Compare genuine contemporary uses.
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