Gundlach Bundschu Winery, Sonoma. Gundlach Bundschu is California's oldest continuously family-owned winery and is the second oldest winery after Buena Vista Winery also in Sonoma. It is still owned and operated by the founder's heirs and operated by Jeff Bundschu who is the sixth generation of his family to do so. As most people have no idea how to pronounce the name of the winery it is known locally as "gun bun".
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