Whether you simply remember Viewmasters fondly or collect Viewmasters obsessively, it's hard to find someone who doesn't at least have good feelings about them.
I have only two complete sets in my collection. The first is the more common 1956 set that was sold at stores outside the park; the second is more rare 1956 set and was sold exclusively inside the park. Each set has unique covers and different images, although some of the alternate images are just similar photos shot from slightly different angles.
This pack is one of the rarest of all the Disneyland Viewmasters. This is the MMC Circus pack that was sold inside the park. The version that was sold outside the park has a yellow cover and features a photo of a little girl on top of an elephant. This one is....different. I wonder if it first went on sale once the MMC Circus had already closed? No wonder this set is so rare; by 1956, visitors to the park probably had no idea what the hell the MMC Circus was.
It's almost impossible to get a complete set of Disneyland Viewmasters what with all of the test packets and foreign versions floating around. And that's not even counting the Tru-Vue slides. To those to you who have managed it, you get a Vintage Disneyland Goodies gold star.