There are single-digit bonded wineries still in existence in California in Oakville.
Well, there’s one. Originally built by two Frenchmen, Jean Adolphe Brun and Jean Chaix, the Brun and Chaix Oakville Winery became the 9th bonded winery in California in 1877. In the late 1870s, as wineries were founded and legally permitted, they were required to post a bond (a type of insurance) to guarantee payment of the federal excise taxes they would incur based on production volumes. Permit numbers were given in sequence beginning with, of course, BW-CA-1 (California bonded winery #1). Today the winemaking facility is called Napa Wine Company and is owned by the Pelissa and Hoxsey families of Ghost Block Estate Wines.