Great ideas so far. I would include a package or two of marbles - maybe the newer Mega nets so people can see what is currently available to buy for their kids to play with.
When I first saw the picture in small size, I was hoping it was one of the Vitro Blackies in the odd style that we see in packaging but rarely in the wild - but, alas, it does look Akro.
A few of my Blackies bags. Also, outside of a bag, the white Blackies might look a lot like a Whitie and may have been ID'd that way. Not sure if harder to find but just two ways to ID so might not be kept by collector as a Blackie.
This is the first one that I have looked at and we need more views to get a good ID. Red & white are hard enough anyway since many companies made similar marbles in those colors. Look at some of the other ID requests where there are 3-4 pictures of different views of same marble. If someone said similar things about another post, I apologize for any duplication of advice.
Here are a couple that Jabo did outside of the licensing process (Armed Forces & Dirty Jobs) but Jabo also had the license to print the others until the licensing group wanted more made and it would not have been profitable for Jabo so they dropped them. There are many more that they did - this is just a few.