I suppose those 1966 Moon photos could be found at the NASA website. Or perhaps at space.com or someone like that. I've forgotten the name of that particular orbiter. But there were also landers at the same time. I think they were called "Surveyor". If you come across those photos, then you've found the 'low res' of that time.
But I don't guess that those pics would be all that impressive by today's standards. I wouldn't doubt that the Hubble telescope could do better. And I think we've got a modern orbiter there right now taking better pictures, digitally, than the film cameras of those days.
I admire NASA for being so audacious. But I doubt if the pics stand up to the stuff that's being produced today. Or in the relatively recent past.
Consider "Cassini" with it's pics actually from the surface of Titan. Or the European probe that has rendezvoused with a comet. Or that other American
probe that did a Ceres flyby. "Curiosity" on Mars. They're getting so numerous that I'm losing track of them.
I'm pessimistic over the prospect of it ever being profitable to send human beings exploring the Solar System. But unmanned probes are doing a terrific job of it.
It's a great time to be alive for those who are interested in such things.