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Printed postmark makes the stamp CTO (Cancelled to Order) ...
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I agree with Roberto. Contrary to a stamp that is issued and cancelled, a stamp with the cancel printed has not been cancelled as it never was a stamp that could be used. There was nothing to cancel to start with.
It can be argued that most - not all - CTO stamps have never been intended to serve a postal use. At least they could have been used as postage stamp until the cancellation mark was applied, cancelling the stamp even before the release date.
There have been plenty philatelic bureaus that sold legitimate mint stamps and made it possible to order the stamp with a cancellation applied on order, i.e., truly CTO.
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IMO, Cinderella stamps are (official) labels, look like postage stamps, but are not.
Those printed with the cancellation applied look like postage stamps. Since they have always been invalidated by the cancel, they are not.
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Hence, the Equatorial Guinea stamps, like the monkeys, are CTO but not Cinderella.
Since they never were conceived to be used as postage stamps, they are, by your own definition, cinderellas.
There is a good argument to call most CTOs cinderellas, as the 'order' was that of the post office and not the collector, but I do not see how the argument works the other way.