Art, are you sure Christensen Agate used cullet? From everything I have read and heard, they only used batch glass. Also, IMHO, this is a CAC Striped Opaque.
I have a big CAC collection and I do think this marble could be Christensen. I think the "9" you are referring to is a 'turkey head'. That doesn't make it more valuable, however. Alley made some flames that are very hard to differentiate from CAC.