This isn't specific to stamp collecting; it applies to all collectibles. As we specialize and become more educated in our hobby(ies), and also as we communicate more with other collectors at a similar level and with experts in the field, our vocabulary naturally also becomes more specialized and jargonistic.
It's easy to "get lost in your own head" and forget that all this specialized terminology doesn't resonate with "normies" (non-collectors).
I've found that the best way to locate "finds" is by perusing listings from non-collectors and frequently outside the stamps hierarchy, and by using more simple words and phrases than I would when discussing with other collectors.
For example, it's not "postal history", "stationery" or even a "cover". It's "envelope with a stamp" or "letter with a stamp". Then add or subtract relevent keywords for years, etc.
It's not a "revenue stamp" or "revenue document" or "fiscal history". It's a "tax stamp" or "receipt with a stamp", etc.
Use words that you might use to describe the item(s) you're looking for to people that know nothing about your collecting specialization, or even stamp collectors at all. Those are the words that will pay dividends. Think of creative alternatives and then combine them into a Boolean OR search (on
ebay you put the terms or phrases inside of parentheses, and a comma separating the phrases is treated as OR). If you want EXACT phrases, put them inside double quotes.
Some of the best founds I've made have come OUTSIDE the stamp categories, from listings where the seller had no idea that there was any stamp-collecting or revenue-stamp related aspect.
But how do you know what categories to look in, both within and outside the stamps category? Don't make that decision and let
ebay do the heavy lifting for you: Do a search with your phrase or keywords, but across ALL of
ebay. Don't be intimidated if it returns thousands of results; you're not going to look through all of them.
The listing of categories at the left with results will be sorted with category with the most results at the top, in descending order. So you can then drill down into the categories that show promise, i.e., I might skip "children's clothes" or "automotive parts" but I might drill down into "Antiques" or "Collectibles". This even works within categories: do a search for "revenue" within United States stamps, and you will see numerous listings NOT in the revenue stamps category. The same may be true for your particular specialization.
For example, I just received this document in the last few days. It was a fixed-price listing that
sat on ebay for over 2 months before I discovered it. Had it been either in a more appropriate category, or been more aptly titled, it would have been snapped up in a heartbeat. The only way I even saw it at all was by utilizing the methods above.
Including shipping and sales tax, it cost me $28, which for a rank and file receipt of the era is actually overpriced, but given the stamp, cancel, and usage, I'll pay this all day, every day, and twice on Sundays. As a bonus, the stamp itself is actually quite nice.
Think outside the box... it's worth it.

