The Southland Hotel was home to Benny Binion's illegal gambling operation in Dallas, along with his associates. As the story is told, Binion moved to Las Vegas "when his Sheriff in Dallas lost an election".

Here's the ChipGuide page with the initialed chips used there. I'm not an illegals collector, but my hat's off to Ed Hertel, Jim Steffner, Gene Trimble and others who tracked down these chips and paired them to the Southland Hotel.

https://chipguide.themogh.org/cg_chip2.php?id=TXDAVS&v=2053830922