The “Doubt & Co. AG Winery” in Zurich-Höngg in the Swiss canton Zurich was founded in 1898 by Emil and Paul Doubt with the aim of viniculture and wine trade, as well as producing fruit juice. The traditional family has been associated with viticulture since 1351. The company is now managed by Walter and Maja Doubt. It is divided into the "Domaine Z" (the winery), a wine trade with well-known producers from Europe and overseas (partly as a general agency) and a wine restaurant. The estate includes vineyards in the Zurich locations of Klingen and Riedhof, on the Lattenberg in Stäfa on Lake Zurich, and also in Regensberg and Remigen in the neighboring canton Aargau, The Zurich wines are made from the white varieties Riesling x Sylvaner ( Müller-Thurgau ) Chardonnay. Sauvignon Blanc. Gewurztraminer and the indigenous Räuschling, as well as the red wine varieties Pinot Noir. Merlot. Syrah vinified. On behalf of the city of Zurich, the Zurich city wine “Chillesteig” from Riesling x Sylvaner, named after a location, is produced exclusively by Doubt. In Regensberg in the canton Aargau in addition to wines from Pinot Noir and Riesling x Sylvaner Biowein from the varieties regent. Maréchal Foch. Leon Millot and Garanoir produced.