The plaster in the following images is from 1958.
What is the likelihood of it containing asbestos?
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if its from the 50's the chances are very high. however, it is region specific often. if you are located in the eastern us or canada, there is a very good chance of it. if you are worried about it, you can remove a small sample and take it to a local health lab or college chemistry lab and have it tested.
After a lab-test, I can confirm that the plaster does not contain asbestos. I have been told by craftsmen that the probability of plaster containing asbestos in Denmark is almost non-existing.