If your project requires revenue material, do not substitute an item described as postage merely because it has a similar appearance. Ask the seller to state the offered category and the basis for that description. If the category is uncertain, keep it uncertain until the evidence needed for your project is available.
The American Philatelic Society vocabulary distinguishes revenue stamps, associated with fees or taxes, from postage payment. This is an educational category distinction. It does not identify, authenticate or establish the current legal use of any item in a seller’s catalog.
Start with the collecting requirement
Specify whether your brief requires a revenue-related collectible, an item classified as postage, or a clearly separated comparison of the two. Avoid using “stamps” as the only category field if the difference determines whether you will accept the goods.
For a display, the required category may be part of the educational story rather than an intended payment use. Say so explicitly. Requesting a tax-related collectible does not mean requesting an instrument that can currently discharge a tax or fee. Current payment eligibility is a different question and is not addressed by this guide.
Ask what supports the offered classification
- Seller description: the exact category claimed for the offered item.
- Visible wording: readable inscriptions or markings, recorded without guessing obscured text.
- Identification source: the reference the seller uses, with enough detail to distinguish the item.
- Scope: whether the description covers every item in the offer or only a photographed example.
- Open question: any missing evidence or classification disagreement that affects acceptance.
A familiar currency symbol or printed amount is not enough to settle the category. Nor does stamp-like size, perforation or attractive artwork establish what an item was issued for. Keep observed features separate from the conclusion drawn from them.
If a mixed offer includes material from a postal savings program, identify the object as precisely as the evidence permits. The postal savings guide explains how to list the stamps, cards and certificates separately and record which pieces are attached.
Use a category gate for mixed proposals
Consider a hypothetical request for six individually described revenue-related items for a study display. A reply offering six “vintage stamps” has not yet answered the requirement. Ask which items are classified as revenue, what supports those classifications and whether any proposed lines remain uncertain.
Do not silently move an uncertain line into the postage group either. A useful review has three outcomes: matches the required category on the evidence reviewed, does not match, or remains unresolved. This is a purchasing review status, not a certificate of authenticity.
If the supplier proposes an alternative category, evaluate it as an explicit change. Quantity and visual similarity do not replace the original requirement. The substitution-approval guide explains how to keep such changes visible in the order record.
For material described as official or departmental, use the official-stamp category guide to specify the claimed historical service category.
Do not infer specialist stock from a general catalog
The Scenic American Landscapes catalog entry, PDD-013 exists as a sourcing reference. It is not evidence that A Stamp Seller stocks revenue material, and its title must not be rewritten as a revenue offer. Start by asking whether the seller can provide a relevant, item-specific proposal.
If no matching material is available or the response supplies only general catalog links, keep the requirement unmet. Do not convert an unanswered specialty request into a confirmed sourcing capability. The same discipline applies if you later describe a proposed item to your own customer.
For an offer described as postage due, consult the postage-due historical role guide before interpreting the printed amount as ordinary sender prepayment.
Keep classification and intended-use verification separate
A supported historical category does not by itself establish current postal eligibility, authenticity, official authorization, tax usefulness or investment value. If any of those questions matters, identify the appropriate independent verification rather than extending a category description beyond its evidence.
Send your required category, intended collecting or display purpose, quantity and evidence questions through the inquiry channel. Ask for each proposed item to be identified separately, with unresolved classifications clearly marked. No availability or commercial terms are implied by this checklist.