I don't know what it is, had it in an old Pelt folder, I know one thing it's a mess whatever it is. Just going by what it was labeled and sold as. Been in that folder fort @ least 9 years I know of so no clue who it came from or where it went ?? Agree, it does have a MK look (kinda)
First one looks like a Foreign sparkler no clue on the second, Views of each side of the marble including the seams and measurements in fractions of an inch will really help in making a more positive ID
Somebody just made a pretty decent score on a Berry Pink, I looked and unless there are some minute pins it's clean, sure it has it's share of asmades, I think all this type do, still pretty HTF now a days in any shape.
Vacor (Hench en Mexico) IMO, I can't remember the name right off hand ? Oop !! found it, I think ?? The streamers in the OP don't appear "Pink" but the iridescent shine and orange peel surface are definitely a Vacor trait.
LINK :: https://www.billes-en-tete.com/liste_billes.php?lang=en
Yes, the OP Y&B Veiligglas is affectionately named after Winnie, the one who gave us all so much information on them, R.I.P. this was posted on AAM while I still had no idea the marble had been named after Her.
LINK :: https://www.allaboutmarbles.com/viewtopic.php?f=7&t=48816&p=352757&hilit=winnie#p352757