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And postmarks are often forged. That is a problem.
Indeed. There are a lot of issues where the used value is a fairly sizable multiple of the mint value. For most areas of philately that means that the stamps are scarcer in used condition than mint, and I assume that's the case with German stamps as well. One would therefore expect
ebay listings to reflect this - i.e. there would be more listings for mint stamps than used ones. But there are some issues where you will find dozens of used examples and maybe a couple mint ones, or even none at all.
On many of those issues (early Berlin immediately comes to mind), I just pretty much assume the cancellations are faked. Looking at Berlin 9NB8-11, for example (cv $8.40 hinged, $22.50 NH, $197.50 used), there are currently 15 sets for sale on
ebay, 12 used, only 3 mint. If genuinely used examples are as scarce as their values would suggest, I would think this ratio would be reversed. One can find many, many more examples like this on
ebay. Even though I collect mostly used stamps, there are a lot of issues I won't buy in used condition for that reason. It's to the point where I wonder if mint examples are getting much scarcer because they've all had fake cancellations applied.