This is part of a greater low but I have really no idea about it.
Its celluloid measures 6.25inches X 7.25 inches,
Its rolled up do to age. its fragile as would be expected but once flattened between two pieces of glass it looks good,
I think its some type of slide for projecting in school. Can you please take a look and see if you know what I have? I cant find a thing that is similar.