I have the same box with the same marbles. I was thinking Vitro too. But to me, the "Victory" label suggests production shortly after WWII and the marbles seem quite a bit newer. One of the reasons I think Vitro over MK or Akro is because of the number of marbles that have seams that are offset by 90 degrees.
Santa's (Rich's) site has lots of JABO pics too - including the Classics, by year.
http://www.santasbling.com/index.php?option=com_content&view=section&layout=blog&id=5&Itemid=53
God's honest truth, Bruce - I had my Gramp's catcher's mitt, signed by the Babe - Mom sold it at a garage sale!
Do you know me? Yeah, I would love that sweater!