This pretty, slightly undersized, two-tone marble came in a lot which was almost entirely modern. (There was a single blackline All-Red plus a bunch of Vacors and modern Asians.)
I checked our favorite Vacor site for matches. If it was there I missed it.
What do you think? The darker brown seems just a little darker or more solid in hand than I'm seeing it on the monitor but overall I think I got the picture close to right.