Stamps that were cancelled by governmental approval, on huge amounts of stamps, to get rid of an overstock.
This happened for example in Costa Rica.
|5 bars cancel|
Costa Rica has a very nice collection of 'classical' stamps from the early years till 1950. Yet, several sets were cancelled by the government and sold under the face value. Maybe a great idea for recycling, or at least to prevent that a lot of stamps were distroyed, but unfortunatly all those stamps found their way to collectors and are now more common than the 'real' cancelled ones. And so I can present them to you, dear followers, so that you can check which stamps are in your collection.
Again here, CTO cancelled stamps have a lower value than postally used stamps.
Luckily, the CTO cancels are easy to recognise again.
|Costa Rica - Michel n° 39 - real cancel and CTO cancel|
|Costa Rica - Michel n° 41 and 42 - 2 types of CTO cancels|
|Costa Rica - Michel n°57 to 62 - 4 CTO, 2 real cancels|