Peter Valdner (2018, updated)
Collectors of ASFE can set criteria what they consider to be ASFE by themselves. A good criterion is the name on the stamp, or an issue destined for certain territory. Usually it is the same, but the history taught us some exceptions. And stamps of MS Lednice can be a good example.
Look at following six stamps. All were designed by the Lednice crew. They bear names Lednice, Lednice GBLA, LEDMELAGA GBLA, Lednice Suez, only GBLA or even no name. Collectors can decide themselves, if they consider them to be six, three (Lednice, LEDMELAGA a GBLA) or just one (GBLA) ASFE.
Some collectors of ASFE use as a decisive criterion the producer, or place where the stamps was produced. At first glimpse the producer is the same as in the previous case, hence Czechoslovak, but it is wrong. Lets us have a look at next four Czechoslovak GBLA stamps. The horizontal one is really Czechoslovak, though with an English text, but the other three were produced in cooperation with British, Bulgarian and Polish crews.
Correct answers can be verified in the Catalogues, which exist both in Slovak and English. A clue for one of them is that the stamp was produced by the famous Captain Benda.