These are Sammy's Mountain marbles and they are 9/16th. Since my cataract surgery I find that my brain interprets differently what my eyes see. I saw that seediness as lutz frit in your #5 pic. these do not have the orange, but that's not to say that my small share contains some of every marble made during this run. these are also 9/16ths and they are a different run from the first In this post. There is no seediness in these marbles, but there is orange. These are a third different run and you can see the gold frit. There is some orange in the ones I have. Yours could be older marbles. Could be vintage, but they reminded me of these. I can't show you JABO's. My pics of JABO's are not handy and i'd have to search. AND I do not have some of every JABO run. I do have some of every Sammy's run. Maybe somebody will find a vintage marble that perfectly matches yours, but yours made me think of these three and one other previously shown.