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Moving farther back in time, there were similar stamps in the 19th and early 20th centuries, referred to as "college stamps" or "business college stamps", which were usually facsimiles of popular designs, used in training classes at business schools/colleges.
They are considered a subcategory of cinderellas and there are catalogs on them (I think some are covered in the 9th edition Springer catalog).
I believe there was a catalog or book on these, written by a guy who I think is from So Cal whose name escapes me at the moment.