I picked up a dozen magic lantern slides in September that are all Olympic related. I did not check them all, but the ones I did were produced by E.R. Deats of 10 S. 18th St., Philadelphia. Many of them were done for the Philadelphia Inter-State Dairy Council. These were colorized photos and it appears that they took a photo of a photo as the quality is not the greatest with dust marks and other flaws. These were done in the late 1940's as they show the 1936 and 1948 Olympics. They were most like done for educational displays as mentioned by Steve. With all of the ones I own you can tell that they were professionally created as the black masking holding the negative is neatly done and the labels are period. Those are some of the things I would look for in assessing one.
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'Integrity is what you do when no one is looking'
"The man who can keep a secret may be wise, but he is not half as wise as the man with no secrets to keep”
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