Over the years there were various sets of souvenir slides available for sale at Disneyland. The Pana-Vue sets are probably the most well-known (look on ebay for Bill Cotter's excellent CD of restored Pana-Vue slide images). But there were other manufacturers, including Sawyers (makers of View Masters), "Super View", and "Treasure Tone".
This neat slide is from the Treasure Tone series. It's certainly an unusual angle, perhaps taken from the roof of the Rocket to the Moon building(?). Just a great early Tomorrowland image.
I have about 40 Treasure Tone slides, and at least some of the images were released in sets produced by other companies - - or maybe all of them were. But the Treasure Tone versions retain their vivid colors some 50 years later. While they might be slightly less interesting than slides taken by Disneyland guests, I think you'll agree that this one is worth a look!