A Sesame Street Playset.
With a copyright date of 1974. Which you can see if you click on the picture above. I swear.
When opened that's what you see from the outside. Check it out bigger to see Hooper's Store sign and the details in the facade. There are even nails keeping it together. Here's the inside.
She didn't have any of the original characters that came with the set, but it doesn't matter. It's in really good condition and G-tot loves it. As soon as he saw it he was going, "Wow. Wow!" I cleaned it up and found a little bendable Elmo (also from Gam's—this time from the 2nd generation, 14 years later) and some other random figures to play with.
The rest of the set can be seen here.