They are 100% Jackson marbles in original Jackson bag. I sold maybe the fist six of these found from a attic in Harrisville WV. That was over twenty years ago. Then the late Bruce Burkhart in about 2006 got a full case of 36 at a auction in north east WV. He sold those over the next three years. The late Mary Jane Wilson last owner of Playrite, in about 2002 brought out from her celler a box of 24. Which she said that she filled or packaged. She sold these over the next two years. They were filled with Jackson marbles. Only two people have seen or access to 100% for sure Playrite marbles that look different from Jacksons. I have tried to see and or photograph these marbles for over ten years. But not yet happened. If it never happens we may never know 100% for sure what a Playrite swirl marble really looks like. Playrite Co. did buy the remaining Jackson mesh bags and headers after Carrol Jackson went out of business. I also am sure that Playrite Co. also bought remaining Jackson marbles after Jackson went out of business. Likely that Mary Jane was not aware of that or remembered that.
As of today only two people have had access to known for sure Playrite marbles. Don't confuse these with the jobber Playtime.
The story Cheese is talking about is Playrite Co., not Davis marble works. The rest of his story is correct.
There are two sizes of these Jackson mesh bags. A large one and a more rare smaller one. The one above is the larger size one. Put a black lighjt on the marbles. These are rare and important bags for machine made marble history.