Hi Vicki,
This chip has been ID'ed by T.R. King and is listed in three books:
The Gaming Table, Audit Ed. of 3rd Ed.
California Chips by Jung & Pfaender
Eastman's Guide to The Chips of California

Mint Cigar Store
609 Castro
Hayward, CA
1946-1951
Your chip was shipped to Harold Lavick in 1948 at this address. It was probably an illegal.