I know this is an old topic, but I recently came across these transparencies on eBay. I ended up getting a couple inexpensive ones, to hang as wall art. I was curious about the history of these, so I asked the seller (apollp5555). Below is the seller's response.
"Photostats and transparencies was created shipped for overseas publishers to they do their own version of the book in foreigner language.
They used cut the text and replace for the foreigner one.
Marvel and DC used ship big packages with covers and story pages plus the 3 sheets of color guide for each pages .
If travel around the world to visit former publisher of these titles you may be able to get this stuff.
I got a huge collection from EBAL EDITORA BRASIL AMERICA LTDA EBAL PUBLISHING - there are a lot stuff in Portuguese.
Today the material is all digital."
I don't have any idea how many of each were made, but they at least seem to be legitimately made by Marvel/DC (at least from this seller).
