When I was 12, I got some clearies of many sizes. I'm pretty sure the source was Champ's Bicentennial bag but not positive -- Santa put them in my stocking and so I didn't see the packaging. But the year was right for them to be the Bicentennial bag.
Sooooo ... as we know, the Bicentennial bags contained marbles from many makers. And the peewees have been said to be Alleys.
Is that still the ID status on those peewees?
The question came to mind today when I came across this muslin bag pic I'd saved long ago. I looked the bag up online today and found that it was filled with peewee clearies.
Source: https://www.liveauctioneers.com/item/2547749_418-champion-agate-sampler-bag
So when would Champ have acquired those peewees for this bag or for the Bicentennial bags? Of course Alley closed long before 1976.