In philately, a cover is usually a complete or substantially preserved mailed envelope, card or wrapper carrying postal evidence. It is not simply an unused envelope, and a decorative cachet does not by itself prove first-day or event status.
Common cover categories
| Type | Defining evidence | Frequent mistake |
|---|---|---|
| First-day cover | Stamp tied to an official first-day date/place, often with a cachet | Assuming any cacheted envelope is an FDC |
| Commercial cover | Created through ordinary business or personal mail use | Dismissing it because it lacks artwork |
| Event or commemorative cover | Prepared around a documented event and postal treatment | Treating the event title as proof without a matching cancel |
| Flight or route cover | Postal marks support a documented transport or route | Relying on an airplane illustration alone |
| Unused souvenir envelope | No actual postal use evidence | Calling it a cover in the postal-history sense |
Read the evidence in layers
- Postage: identify stamps or indicia and their issue period.
- Postmark: transcribe date and place exactly.
- Cancellation: note how postage was invalidated.
- Address and endorsements: record routing and service instructions.
- Back of cover: inspect transit, arrival and receiving marks.
- Cachet and enclosure: document them, but keep private printing separate from postal evidence.
Condition and value boundaries
Opening tears, reductions, stains and missing backs can matter, but postal significance sometimes outweighs cosmetic appearance. Value requires a comparable exact type, route, date and condition—not merely an old date or attractive cachet. High-value material should receive expert examination.
Related guides
Sources and verification
Facts on this page were checked on August 31, 2026. Dynamic inventory, prices and USPS rules can change.
Sources and update note
Use the linked primary record for the exact issue, rule or current condition. Prices, availability and platform features can change and should be checked at the time of use.