Interesting group, shame the stamp is missing from a few, but it seems to happen a lot with post cards. Bought a lot once that a family had collected, some of whom collected stamps, and peeled them of the card. I knew you'd find lots of threads to add to in this forum. Keep posting, Lots of us like postcards! Had to laugh at the "Queen to the Beaches" card, as I spent the summer of 1959 about 1/2 mile from the "Pike" in Long Beach.
There is a long letter, handwritten in pencil, on the back of the strip of six photos, but it would be troublesome & invasive to scan, and was mostly winky-winky "sorry you can't visit right now" family humor.
I think this one is in need of a bump! I found a very old fold-out (for a buck!) from the 1907 Jamestown Exposition. This is certainly the oldest one in my collection -- do they go back much further? Technically, I wonder whether it qualifies as a postcard. The back side of the wrapper is blank, with no indication about how to mail it, but the option was certainly there.