A brochure’s cover can make a product look like the whole subject, while its final panel explains who offered it, where and under what conditions. Read the document as a folded object before extracting its headline.
Check the page or panel sequence. Look for a distributor’s details, an order form, a date code or a statement about the range shown. Keep these separate from the manufacturer’s identity; a local seller may have added its own stamp or label.
Record which features are printed and which appear to be later additions. A handwritten price belongs to the history of this copy unless evidence shows a broader published price.
For an invented example, a catalogue cover names a product line while the reverse advertises a regional stockist. That supports a question about distribution, not proof that every illustrated item was actually available there.
If the digital copy omits the reverse, write that limitation into the source note. Do not assume an image gallery’s last displayed page is the physical document’s back cover.
The extra panel may turn a generic product description into a specific account of selling and circulation. Its value lies in the relationship between the object advertised and the route through which a reader was invited to obtain it.
Editorial illustration from the site’s image collection.