Some countries have issued stamps that hardly are collected mint. In order sell the rather useless stamps, and to avoid they are re-used for postal usage. They are cancelled CTO.
Most of them are easily recognised, as the title says : the obvious ones.
The list of CTO cancels is nearly endless...
luckily the 'obvious' ones are easy to regognise. At least if you have a couple of the same country or set, to compare.
A good way to recognise is that the CTO cancels mainly refer to the capital city.
Liberia -> Monrovia
or the name of the country is on the cancel (you won't see that on most postally used cancels)
Togo, Tanzania, Equatorial Guinea, ...
or 4 stamps can easily be put together, forming the complete cancel.
Almost all of those cancels are printed, and not 'stamped' as they usually do in postoffices.
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