I remember back around the 1970', in the UK, s that GAF sold sets of 4 super-slides, in a plastic display sleeve, of various subjects, mainly historic places, as souvenirs in photoshops and holiday places (I think they were also sold as "Sawyers Panavue" brand?). I have a few sets bought by my late parents, and I'm guessing that the slides may have been Anscochrome or something like that....they were excellent quality when new, but some have deteriorated to the pink/purple color typical of duplicates from negatives from that era.