Private perforation describes who applied a separating feature, not simply how an edge looks. If a collection requires material associated with a particular company or historical application, ask for that attribution explicitly. A perforated edge and a company-specific identification are different pieces of information.
Understand the attribution in the term
The National Postal Museum glossary defines private perforation as perforation applied by an individual or company rather than by the issuing authority. It notes that companies used particular perforations to suit vending and mailing machinery. That historical purpose provides context, but does not identify the maker of an unfamiliar edge pattern.
Keep the applying party distinct from the printer of the original stamp design. An offer naming a printing organization has not necessarily answered who applied the separating feature. Ask the seller to identify which role each named organization is said to have performed.
Do not assume every historical example had the same use
The museum’s account of the Alaska-Yukon-Pacific Exposition issue explains that its imperforate stamps were intended for private perforation and coiling. It also notes that their size was poorly suited to the machinery and that most surviving privately perforated examples were made as favors to collectors.
For a separate 1909 example, Daniel A. Piazza’s study of the Hudson–Fulton commemorative records private perforations made by U.S. Automatic, Mail-O-Meter, Schermack and Brinkerhoff. Those attributions concern the Hudson–Fulton issue. For another issue, compare the exact stamp and its perforation pattern with a reference that documents that combination.
This is a specific historical example, not a rule for all issues or evidence about present inventory. It demonstrates why an attributed private perforation should not automatically become a claim that the offered piece was actually used in a vending or mailing machine. Intended purpose and documented use should remain separate.
Build three linked descriptions for the offered item
Start with the visible feature: which edges are shown, where separating holes appear, and which parts are obscured. The edge-description guide covers that observation stage. It does not supply the historical attribution.
Next, record the seller’s claimed applying party and the precise perforation designation, if one is provided. Retain qualifications such as “attributed to” or “unidentified.” Finally, record the issue-specific source and the explanation connecting the offered piece to the named designation.
- Observed edge feature and the image that shows it.
- Claimed applying party, type and historical context.
- Reference or existing specialist opinion supporting the item match.
A complete first entry can coexist with an unresolved second or third entry. Do not use a familiar company name to fill the gap merely because its machinery appears in a general history of private perforations.
Keep edge perforations separate from perfin initials
An interior punched pattern associated with an organization raises a different question from separating perforations at the edge. The perfin-attribution guide deals with matching those interior patterns. Evidence identifying a perfin user does not automatically identify the party responsible for an edge feature on the same object.
For a mixed lot, ask which description applies to each piece. One documented example should not confer the same attribution on other pieces merely because they share a design or are photographed together.
Use the uncertainty to make a clear selection decision
Imagine a fictional offer with visible edge perforations and a tentative company attribution, but no source connecting the two. A buyer requiring that company’s material should keep the line pending. A buyer studying unidentified edge forms might consider it under the limited description, provided that narrower scope is made explicit.
Do not infer that an unexplained feature is either a documented historical private application or a modern alteration. Both would go beyond the evidence. Where the distinction matters, request appropriate specialist review without punching, trimming or otherwise changing the item.
Ask about the actual item, not a general catalog illustration
The Scenic American Landscapes entry, PDD-013, supplies a catalog reference for inquiries. It does not establish private-perforation stock or a named-company attribution. Send the actual offer and the applying-party requirement, and ask what evidence is available for that item.
Keep availability, condition, authenticity, price and any intended postal use as separate questions. Neither a historical company connection nor this inquiry checklist establishes official seller authorization or future value.