It sure looks like it. As a note... "attribution" doesn't mean "confirmed". it means people "think" that it is from there with no real proof. A guess, really. You can check out the Calif Chip guide here with the pic:

http://cashcoinconnection.com/Casino/USA/CA/CardRooms/B.pdf

Also, don't stress out too much about it, many people make the same mistake. I bought a "Silver Slipper" that was attributed to Vegas and later found out it probably is from Canada.

Happy holidays, everyone.