
Each photo (photos front and back, so 4 photos total) is 4.25″ wide. The glasses are just under 4.25″ wide.
Unable to travel much this year, I’ve had a little extra cash to investigate the odder eBay finds. These Roy Rogers photos are a good example of that type of purchase. I’ve learned that if you see something on eBay that has been with a seller a while, put it on your watchlist. Sometimes the seller will respond with a discount offer. In this case, I countered with an even lower offer, explaining that I didn’t collect Roy Rogers stuff and only wanted the images for the one jeep image. That seemed to work, as the seller accepted my counteroffer.

My eyes failed me … I never did get the image to look really 3D. I also didn’t want to disconnect the glasses from the photos.
Once delivered I was surprised by two things. First, the 3D viewer was much smaller than expected, but then I realized, duh, they are for kids. For me to view the image wasn’t all that easy through the tiny glasses (4.25 inches from end to end). It also didn’t help that my eyes (I’ll be 55 on Friday) are a little too old; I needed to wear glasses when looking through viewer at the focal length required, but that whole thing became awkward and I never could get the full 3D effect.

All three items were still connected as they originally were. Above them is an 8.5″ piece of paper to give a sense of size.
The second thing that surprised me that the glasses were still attached to the two images and the two images were still attached to each other, meaning these images and viewer had never been used. All three items still folded up into a neat little, compact package.
I just don’t know how stuff like this has survived more than 50 years!