RARE Marguerite Wildenhain Pond Farm Studio Pottery Bowl California Vintage. This is a rare vintage Pond Farm Studio pottery bowl by Marguerite Wildenhain from Guerneville California. The bowl is made of ceramic and features a beautiful blue color. It is a unique piece of decorative cookware and dinnerware, perfect for adding a touch of artistry to your home. See photos for condition – if you have questions please message us and we’ll do our best to get back to you within 24hrs.